TIFF format has provided long service for digital imaging. TIFF files declare

and describe their content by means of
tags
in the header and in Image

File Directories (IFDs) within the file. Tags can indicate the basic geometry

of the image, define how the image data is arranged, and indicate such facts

as whether one or another image compression option has been used. TIFF tags

defined by the 1992 TIFF 6.0
specification
fall in the first two source categories listed below:
baseline
and
extended
. The specification also established procedures for further

extension, and this has led to the establishment of tags in the two additional

categories:
private
and
private IFD
. Some of the private and

private IFD tags have been codified in additional specifications:
TIFF/EP
(ISO 12234-2, 2001),
TIFF/IT
(ISO 12639, 2004), DNG, and
EXIF_2_2

discussed in the private IFD section below. Although the format description for DNG at this Web site (at the time of writing) describes version 1.1 (
DNG_1_1
; published by Adobe in 2005), the tag list below includes new tags added in DNG versions 1.2, 1.3, and 1.4 (2012).
Although not a true TIFF implementation, Windows Media Photo/HD Photo (
WMP_1_0
; now standardized as JPEG XR, ISO/IEC 29199-2:2012) employs a container format that borrows heavily from

TIFF and adds a few new tags of interest, further extending the tag set

in at least an informal sense. There are other proprietary or industry specifications

that continue to extend TIFF, e.g.,
GeoTIFF_1_0
, HylaFAX, and the Molecular Dynamics

GEL format, and some of these tags have been folded into the table and identified

in the short definitions or notes.
The TIFF specification requires that tags be encoded in numerical order

and that is the sequence used in the table below. The
GPS
and
interoperability
tags appear to employ separate numerical series and they have been omitted

from the table;
comments welcome

The fifth column in the table indicates the
source
for each tag,

and these sources are described below. The table and the data it contains

owe a great debt to the
AWare

Systems
Web site. Many references in these tables are linked to additional

information provided at the AWare site. Interested persons may also wish

to consult Ross Finlayson's
TIFF Web page, available through Internet Archive
Sources for tag specifications
TIFF Baseline
. The
baseline
set of tags were

documented in TIFF 5.0 and carried over on pages 11-47 of the 1992 TIFF

6.0
specification
TIFF Extended
. The
extended
set includes some

additional tags and added values for existing tags, as documented on pages

48-115 of the TIFF 6.0
specification
TIFF Private
. Originally, the term
private
meant just that. The TIFF 6.0
specification
(page 8) states, "An organization might wish to store information

meaningful to only that organization . . . . Tags numbered 32768 or higher,

sometimes called private tags, are reserved for that purpose. Upon request,

the TIFF administrator . . . will allocate and register one or more private

tags for an organization . . . . You do not need to tell the TIFF administrator

what you plan to use them for, but giving us this information may help

other developers to avoid some duplication of effort." Over time,

however, many private tags have become well established and well documented,

e.g., tag 34675 for the ICC profile, dubbed
InterColorProfile
in the
TIFF/EP
standard. Thus, many members of the private

tag class can be viewed as open
extensions
rather than as containers

for secret information.
TIFF/EP
TIFF/IT
, and
DNG
. A number of tags, some of which may once have been "private," have been defined in
TIFF/EP
(ISO 12234-2, 2001),
TIFF/IT
(ISO 12639, 2004), and
DNG_1_1
, an Adobe-sponsored extension of the TIFF 6.0 specification. As noted above, although this Web site's most recent description for DNG is version 1.1 (specfication published 2005), this tag list includes new tags added in versions 1.2, 1.3, and 1.4.
TIFF Private IFD
The TIFF 6.0
specification
(page 9) states, "If you need more than 10 tags, we suggest that you

reserve a single private tag, define it as a LONG TIFF data type, and

use its value as a pointer (offset) to a private IFD [image file directory]

or other data structure of your choosing. Within that IFD, you can use

whatever tags you want, since no one else will know that it is an IFD

unless you tell them." As with
private tags
, we can understand
private IFDs
as an extension to TIFF, often very public and well

documented.
The private IFD tags of greatest interest to the Library of Congress are

those associated with the
EXIF_2_2
specification, pertaining to image generation by digital still cameras.

Exif is an abbreviation for
EXchangeable Image File format

although Exif does not relate to TIFF as, say,
JFIF
relates to
JPEG_DCT
. The Exif IFD is pointed to by the Private Exif IFD tag 34665. This and other Exif tags are listed in the numerical table below.
For links to Exif specifications and other related information,

see
EXIF_2_2
. The Exif standard established three private IFDs, and tags from the main Exif IFD are included in the list below. Tags for the other two Exif IFDs are listed at the Aware Web site:
GPS

IFD
, for positioning information, and
Interoperability IFD
, used to encode compability information. With numerical sequences of their own, the GPS and Interoperability tags are not included in the table below. A third-party listing of all Exif tags is available from
Exiv2
HD Photo tags.
Although not a true TIFF implementation, Windows Media Photo/HD Photo (
WMP_1_0
; now standardized as JPEG XR, ISO/IEC 29199-2:2012) employs a container format that borrows from

TIFF and adds a few new tags of interest, further extending the tag set

in at least an informal sense.
Tags in Numerical Order
Code
Name
Short description
Source of tag
Note
Dec
Hex
254
00FE
NewSubfileType
A general indication of the kind of data contained in this subfile.
Baseline
Usage rule in JHOVE
TIFF module
Mandatory for TIFF/EP.
255
00FF
SubfileType
A general indication of the kind of data contained in this subfile.
Baseline
256
0100
ImageWidth
The number of columns in the image, i.e., the number of pixels per row.
Baseline
Mandatory for TIFF 6.0 classes B, G, P, R, and Y.
Mandatory for TIFF/EP.
Mandatory for primary TIFF IFD in Exif. (Note that for JPEG compressed data, a JPEG marker is used instead of this tag. See
JEITA CP-3451: Exif 2.2
.)
257
0101
ImageLength
The number of rows of pixels in the image.
Baseline
Mandatory for TIFF 6.0 classes B, G, P, R, and Y.
Mandatory for TIFF/EP.
Mandatory for primary TIFF IFD in Exif. (Note that for JPEG compressed data, a JPEG marker is used instead of this tag. See
JEITA CP-3451: Exif 2.2
.)
258
0102
BitsPerSample
Number of bits per component.
Baseline
Mandatory for TIFF 6.0 classes G, P, R, and Y.
Mandatory for TIFF/EP.
Mandatory for primary TIFF IFD in Exif. (Note that for JPEG compressed data, a JPEG marker is used instead of this tag. See
JEITA CP-3451: Exif 2.2
.)
Required by
DLF benchmark guidelines (available via Internet Archive).
259
0103
Compression
Compression scheme used on the image data.
Baseline
Sample values: 1=uncompressed and 4=CCITT Group 4.
Mandatory for TIFF 6.0 classes B, G, P, R, and Y.
Mandatory for TIFF/EP.
Mandatory for primary TIFF IFD in Exif. (Note that this tag is omitted when primary image is JPEG compressed. See
JEITA CP-3451: Exif 2.2
.)
Required by
DLF benchmark guidelines (available via Internet Archive).
262
0106
PhotometricInterpretation
The color space of the image data.
Baseline
Sample values: 1=black is zero and 2=RGB. Document also states "RGB is assumed to be sRGB; if RGB, an ICC profile should be present in the 34675 tag."
Mandatory for TIFF 6.0 classes B, G, P, R, and Y.
Mandatory for TIFF/EP.
Mandatory for
GeoTIFF_1_0
Mandatory for primary TIFF IFD in Exif. (Note that for JPEG compressed data, a JPEG marker is used instead of this tag. See
JEITA CP-3451: Exif 2.2
.)
Required by
DLF benchmark guidelines (available via Internet Archive).
263
0107
Threshholding
For black and white TIFF files that represent shades of gray, the technique used to convert from gray to black and white pixels.
Baseline
Usage rule in JHOVE
TIFF module
264
0108
CellWidth
The width of the dithering or halftoning matrix used to create a dithered or halftoned bilevel file.
Baseline
265
0109
CellLength
The length of the dithering or halftoning matrix used to create a dithered or halftoned bilevel file.
Baseline
Usage rule in JHOVE
TIFF module
266
010A
FillOrder
The logical order of bits within a byte.
Baseline
269
010D
DocumentName
The name of the document from which this image was scanned.
Extended
Also used by HD Photo.
270
010E
ImageDescription
A string that describes the subject of the image.
Baseline
Also used by HD Photo
271
010F
Make
The scanner manufacturer.
Baseline
Also used by HD Photo.
Mandatory for TIFF/EP.
272
0110
Model
The scanner model name or number.
Baseline
Also used by HD Photo.
Mandatory for TIFF/EP.
273
0111
StripOffsets
For each strip, the byte offset of that strip.
Baseline
Mandatory for TIFF 6.0 classes B, G, P, R, and Y.
(Files outside of these classes may use tiles and tags 322, 323, 324, and 325;
Comments welcome
.)
Mandatory in TIFF/EP for stripped images.
For Exif, mandatory in primary TIFF IFD.
274
0112
Orientation
The orientation of the image with respect to the rows and columns.
Baseline
Mandatory for TIFF/EP.
277
0115
SamplesPerPixel
The number of components per pixel.
Baseline
Mandatory for TIFF 6.0 classes R and Y.
For Exif, mandatory in primary TIFF IFD.
Required by
DLF benchmark guidelines
278
0116
RowsPerStrip
The number of rows per strip.
Baseline
Mandatory for TIFF 6.0 classes B, G, P, R, and Y.
(Files outside of these classes may use tiles and tags 322, 323, 324, and 325;
Comments welcome
.)
Mandatory in TIFF/EP for stripped images.
For Exif, mandatory in primary TIFF IFD.
279
0117
StripByteCounts
For each strip, the number of bytes in the strip after compression.
Baseline
Mandatory for TIFF 6.0 classes B, G, P, R, and Y.
(Files outside of these classes may use tiles and tags 322, 323, 324, and 325;
Comments welcome
.)
Mandatory in TIFF/EP for stripped images.
For Exif, mandatory in primary TIFF IFD.
280
0118
MinSampleValue
The minimum component value used.
Baseline
281
0119
MaxSampleValue
The maximum component value used.
Baseline
282
011A
XResolution
The number of pixels per ResolutionUnit in the ImageWidth direction.
Baseline
Xresolution is a Rational; ImageWidth (Tag 256)

is the numerator and the length of the source (measured in the units

specified in ResolutionUnit (Tag 296)) is the denominator.
Mandatory for TIFF 6.0 classes B, G, P, R, and Y.
Mandatory for TIFF/EP.
For Exif, mandatory in primary TIFF IFD.
Required by
DLF benchmark guidelines (available through Internet Archive).
283
011B
YResolution
The number of pixels per ResolutionUnit in the ImageLength direction.
Baseline
Mandatory for TIFF 6.0 classes B, G, P, R, and Y.
Mandatory for TIFF/EP.
For Exif, mandatory in primary TIFF IFD.
Required by
DLF benchmark guidelines (available through Internet Archive).
284
011C
PlanarConfiguration
How the components of each pixel are stored.
Baseline
Mandatory for TIFF/EP.
285
011D
PageName
The name of the page from which this image was scanned.
Extended
Also used by HD Photo
286
011E
XPosition
X position of the image.
Extended
287
011F
YPosition
Y position of the image.
Extended
288
0120
FreeOffsets
For each string of contiguous unused bytes in a TIFF file, the byte offset of the string.
Baseline
289
0121
FreeByteCounts
For each string of contiguous unused bytes in a TIFF file, the number of bytes in the string.
Baseline
290
0122
GrayResponseUnit
The precision of the information contained in the GrayResponseCurve.
Baseline
291
0123
GrayResponseCurve
For grayscale data, the optical density of each possible pixel value.
Baseline
292
0124
T4Options
Options for Group 3 Fax compression
Extended
293
0125
T6Options
Options for Group 4 Fax compression
Extended
296
0128
ResolutionUnit
The unit of measurement for XResolution and YResolution.
Baseline
Mandatory for TIFF 6.0 classes B, G, P, R, and Y.
Mandatory for TIFF/EP.
For Exif, mandatory in primary TIFF IFD.
297
0129
PageNumber
The page number of the page from which this image was scanned.
Extended
Also used by HD Photo
301
012D
TransferFunction
Describes a transfer function for the image in tabular style.
Extended
305
0131
Software
Name and version number of the software package(s) used to create the image.
Baseline
Also used by HD Photo.
Mandatory for TIFF/EP.
306
0132
DateTime
Date and time of image creation.
Baseline
Also used by HD Photo.
Usage rule in JHOVE
TIFF module
Mandatory for TIFF/EP.
315
013B
Artist
Person who created the image.
Baseline
Also used by HD Photo
316
013C
HostComputer
The computer and/or operating system in use at the time of image creation.
Baseline
Also used by HD Photo
317
013D
Predictor
A mathematical operator that is applied to the image data before an encoding scheme is applied.
Extended
318
013E
WhitePoint
The chromaticity of the white point of the image.
Extended
319
013F
PrimaryChromaticities
The chromaticities of the primaries of the image.
Extended
320
0140
ColorMap
A color map for palette color images.
Baseline
Mandatory for TIFF 6.0 class P.
321
0141
HalftoneHints
Conveys to the halftone function the range of gray levels within a colorimetrically-specified image that should retain tonal detail.
Extended
322
0142
TileWidth
The tile width in pixels. This is the number of columns in each tile.
Extended
Mandatory for TIFF 6.0 files that use tiles. (Files that use strips employ tags 273, 278, and 279.)
Mandatory in TIFF/EP for tiled images.
323
0143
TileLength
The tile length (height) in pixels. This is the number of rows in each tile.
Extended
Referenced in JHOVE
TIFF module
for files that use tiles. (Files that use strips employ tags 273, 278, and 279.)
Mandatory in TIFF/EP for tiled images.
324
0144
TileOffsets
For each tile, the byte offset of that tile, as compressed and stored on disk.
Extended
Mandatory for TIFF 6.0 files that use tiles. (Files that use strips employ tags 273, 278, and 279.)
Mandatory in TIFF/EP for tiled images.
325
0145
TileByteCounts
For each tile, the number of (compressed) bytes in that tile.
Extended
Mandatory for TIFF 6.0 files that use tiles. (Files that use strips employ tags 273, 278, and 279.)
Mandatory in TIFF/EP for tiled images.
326
0146
BadFaxLines
Used in the TIFF-F standard, denotes the number of 'bad' scan lines encountered by the facsimile device.
Extended
327
0147
CleanFaxData
Used in the TIFF-F standard, indicates if 'bad' lines encountered during reception are stored in the data, or if 'bad' lines have been replaced by the receiver.
Extended
328
0148
ConsecutiveBadFaxLines
Used in the TIFF-F standard, denotes the maximum number of consecutive 'bad' scanlines received.
Extended
330
014A
SubIFDs
Offset to child IFDs.
Extended
332
014C
InkSet
The set of inks used in a separated (PhotometricInterpretation=5) image.
Extended
333
014D
InkNames
The name of each ink used in a separated image.
Extended
334
014E
NumberOfInks
The number of inks.
Extended
336
0150
DotRange
The component values that correspond to a 0% dot and 100% dot.
Extended
Usage rule in JHOVE
TIFF module
337
0151
TargetPrinter
A description of the printing environment for which this separation is intended.
Extended
338
0152
ExtraSamples
Description of extra components.
Baseline
339
0153
SampleFormat
Specifies how to interpret each data sample in a pixel.
Extended
340
0154
SMinSampleValue
Specifies the minimum sample value.
Extended
341
0155
SMaxSampleValue
Specifies the maximum sample value.
Extended
342
0156
TransferRange
Expands the range of the TransferFunction.
Extended
343
0157
ClipPath
Mirrors the essentials of PostScript's path creation functionality.
Extended
Usage rule in JHOVE
TIFF module
344
0158
XClipPathUnits
The number of units that span the width of the image, in terms of integer ClipPath coordinates.
Extended
Usage rule in JHOVE
TIFF module
345
0159
YClipPathUnits
The number of units that span the height of the image, in terms of integer ClipPath coordinates.
Extended
346
015A
Indexed
Aims to broaden the support for indexed images to include support for any color space.
Extended
347
015B
JPEGTables
JPEG quantization and/or Huffman tables.
Extended
351
015F
OPIProxy
OPI-related.
Extended
400
0190
GlobalParametersIFD
Used in the TIFF-FX standard to point to an IFD containing tags that are globally applicable to the complete TIFF file.
Extended
401
0191
ProfileType
Used in the TIFF-FX standard, denotes the type of data stored in this file or IFD.
Extended
402
0192
FaxProfile
Used in the TIFF-FX standard, denotes the 'profile' that applies to this file.
Extended
403
0193
CodingMethods
Used in the TIFF-FX standard, indicates which coding methods are used in the file.
Extended
404
0194
VersionYear
Used in the TIFF-FX standard, denotes the year of the standard specified by the FaxProfile field.
Extended
405
0195
ModeNumber
Used in the TIFF-FX standard, denotes the mode of the standard specified by the FaxProfile field.
Extended
433
01B1
Decode
Used in the TIFF-F and TIFF-FX standards, holds information about the ITULAB (PhotometricInterpretation = 10) encoding.
Extended
434
01B2
DefaultImageColor
Defined in the Mixed Raster Content part of RFC 2301, is the default color needed in areas where no image is available.
Extended
512
0200
JPEGProc
Old-style JPEG compression field. TechNote2 invalidates this part of the specification.
Extended
513
0201
JPEGInterchangeFormat
Old-style JPEG compression field. TechNote2 invalidates this part of the specification.
Extended
514
0202
JPEGInterchangeFormatLength
Old-style JPEG compression field. TechNote2 invalidates this part of the specification.
Extended
515
0203
JPEGRestartInterval
Old-style JPEG compression field. TechNote2 invalidates this part of the specification.
Extended
517
0205
JPEGLosslessPredictors
Old-style JPEG compression field. TechNote2 invalidates this part of the specification.
Extended
518
0206
JPEGPointTransforms
Old-style JPEG compression field. TechNote2 invalidates this part of the specification.
Extended
519
0207
JPEGQTables
Old-style JPEG compression field. TechNote2 invalidates this part of the specification.
Extended
520
0208
JPEGDCTables
Old-style JPEG compression field. TechNote2 invalidates this part of the specification.
Extended
521
0209
JPEGACTables
Old-style JPEG compression field. TechNote2 invalidates this part of the specification.
Extended
529
0211
YCbCrCoefficients
The transformation from RGB to YCbCr image data.
Extended
Mandatory for TIFF/EP YCbCr images.
530
0212
YCbCrSubSampling
Specifies the subsampling factors used for the chrominance components of a YCbCr image.
Extended
Mandatory for TIFF/EP YCbCr images.
531
0213
YCbCrPositioning
Specifies the positioning of subsampled chrominance components relative to luminance samples.
Extended
Mandatory for TIFF/EP YCbCr images.
532
0214
ReferenceBlackWhite
Specifies a pair of headroom and footroom image data values (codes) for each pixel component.
Extended
Mandatory for TIFF 6.0 class Y.
Mandatory for TIFF/EP YCbCr images.
559
022F
StripRowCounts
Defined in the Mixed Raster Content part of RFC 2301, used to replace RowsPerStrip for IFDs with variable-sized strips.
Extended
700
02BC
XMP
XML packet containing XMP metadata
Extended
Also used by HD Photo
18246
4746
Image.Rating
Ratings tag used by Windows
Exif private IFD
18249
4749
Image.RatingPercent
Ratings tag used by Windows, value as percent
Exif private IFD
32781
800D
ImageID
OPI-related.
Extended
32932
80A4
Wang Annotation
Annotation data, as used in 'Imaging for Windows'.
Private
33421
828D
CFARepeatPatternDim
For camera raw files from sensors with CFA overlay.
TIFF/EP spec, p. 23
Exif private IFD
Mandatory in TIFF/EP for CFA files.
33422
828E
CFAPattern
For camera raw files from sensors with CFA overlay.
TIFF/EP spec, p. 23
Exif private IFD
Mandatory in TIFF/EP for CFA files.
33423
828F
BatteryLevel
Encodes camera battery level at time of image capture.
TIFF/EP spec, p. 45
Exif private IFD
33432
8298
Copyright notice.
Baseline
Also used by HD Photo.
Mandatory for TIFF/EP
33434
829A
ExposureTime
Exposure time, given in seconds.
Exif Private IFD
TIFF/EP spec, p. 38
33437
829D
FNumber
The F number.
Exif Private IFD
TIFF/EP spec, p. 39
33445
82A5
MD FileTag
Specifies the pixel data format encoding in the Molecular Dynamics GEL file format.
Private
33446
82A6
MD ScalePixel
Specifies a scale factor in the Molecular Dynamics GEL file format.
Private
33447
82A7
MD ColorTable
Used to specify the conversion from 16bit to 8bit in the Molecular Dynamics GEL file format.
Private
33448
82A8
MD LabName
Name of the lab that scanned this file, as used in the Molecular Dynamics GEL file format.
Private
33449
82A9
MD SampleInfo
Information about the sample, as used in the Molecular Dynamics GEL file format.
Private
33450
82AA
MD PrepDate
Date the sample was prepared, as used in the Molecular Dynamics GEL file format.
Private
33451
82AB
MD PrepTime
Time the sample was prepared, as used in the Molecular Dynamics GEL file format.
Private
33452
82AC
MD FileUnits
Units for data in this file, as used in the Molecular Dynamics GEL file format.
Private
33550
830E
ModelPixelScaleTag
Used in interchangeable
GeoTIFF_1_0
files.
Private
33723
83BB
IPTC/NAA
IPTC-NAA (International Press Telecommunications Council-Newspaper Association of America) metadata.
TIFF/EP spec, p. 33
Tag name and values defined by IPTC-NAA Info Interchange Model & Digital Newsphoto Parameter Record.
Called
IPTS
at AWare Web site.
33918
847E
INGR Packet Data Tag
Intergraph Application specific storage.
Private
33919
847F
INGR Flag Registers
Intergraph Application specific flags.
Private
33920
8480
IrasB Transformation Matrix
Originally part of Intergraph's GeoTIFF tags, but likely understood by IrasB only.
Private
33922
8482
ModelTiepointTag
Originally part of Intergraph's GeoTIFF tags, but now used in interchangeable
GeoTIFF_1_0
files.
Private
In
GeoTIFF_1_0
, either this tag or 34264 must be defined, but not both
34016
84E0
Comments welcome.
Site
Site where image created.
TIFF/IT spec, 7.2.3
Hex value not provided in TIFF/IT spec 7.2.3. Hex value determined by decimal converter tool.
34017
84E1
Comments welcome.
ColorSequence
Sequence of colors if other than CMYK.
TIFF/IT spec, 7.2.8.3.2
For BP and BL only
Hex value not provided in TIFF/IT spec 7.2.8.3.2. Hex value determined by decimal converter tool.
34018
84E2
Comments welcome.
IT8Header
Certain inherited headers.
TIFF/IT spec, 7.2.3
Obsolete
Hex value not provided in TIFF/IT spec 7.2.3. Hex value determined by decimal converter tool.
34019
84E3
Comments welcome.
RasterPadding
Type of raster padding used, if any.
TIFF/IT spec, 7.2.6
Hex value not provided in TIFF/IT spec 7.2.6. Hex value determined by decimal converter tool.
34020
84E4
Comments welcome.
BitsPerRunLength
Number of bits for short run length encoding.
TIFF/IT spec, 7.2.6
For LW only
Hex value not provided in TIFF/IT spec 7.2.6. Hex value determined by decimal converter tool.
34021
84E5
Comments welcome.
BitsPerExtendedRunLength
Number of bits for long run length encoding.
TIFF/IT spec, 7.2.6
For LW only
Hex value not provided in TIFF/IT spec 7.2.6. Hex value determined by decimal converter tool.
34022
84E6
Comments welcome.
ColorTable
Color value in a color pallette.
TIFF/IT spec, 7.2.8.4
For BP and BL only
Hex value not provided in TIFF/IT spec 7.2.8.4. Hex value determined by decimal converter tool.
34023
84E7
Comments welcome.
ImageColorIndicator
Indicates if image (foreground) color or transparency is specified.
TIFF/IT spec, 7.2.9
For MP, BP, and BL only
Hex value not provided in TIFF/IT spec 7.2.9. Hex value determined by decimal converter tool.
34024
84E8
Comments welcome.
BackgroundColorIndicator
Background color specification.
TIFF/IT spec, 7.2.9
For BP and BL only
Hex value not provided in TIFF/IT spec 7.2.9. Hex value determined by decimal converter tool.
34025
84E9
Comments welcome.
ImageColorValue
Specifies image (foreground) color.
TIFF/IT spec, 7.2.8.4
For MP, BP, and BL only
Hex value not provided in TIFF/IT spec 7.2.8.4. Hex value determined by decimal converter tool.
34026
84EA
Comments welcome.
BackgroundColorValue
Specifies background color.
TIFF/IT spec, 7.2.8.4
For BP and BL only
Hex value not provided in TIFF/IT spec 7.2.8.4. Hex value determined by decimal converter tool.
34027
84EB
Comments welcome.
PixelIntensityRange
Specifies data values for 0 percent and 100 percent pixel intensity.
TIFF/IT spec, 7.2.8.4
For MP only
Hex value not provided in TIFF/IT spec 7.2.8.4. Hex value determined by decimal converter tool.
34028
84EC
Comments welcome.
TransparencyIndicator
Specifies if transparency is used in HC file.
TIFF/IT spec, 7.2.8.4
For HC only
Hex value not provided in TIFF/IT spec 7.2.8.4. Hex value determined by decimal converter tool.
34029
84ED
Comments welcome.
ColorCharacterization
Specifies ASCII table or other reference per ISO 12641 and ISO 12642.
TIFF/IT spec, 7.2.8.4
Hex value not provided in TIFF/IT spec 7.2.8.4. Hex value determined by decimal converter tool.
34030
84EE
Comments welcome.
HCUsage
Indicates the type of information in an HC file.
TIFF/IT spec, 7.2.6
For HC only
Hex value not provided in TIFF/IT spec 7.2.6. Hex value determined by decimal converter tool.
34031
84EF
Comments welcome.
TrapIndicator
Indicates whether or not trapping has been applied to the file.
TIFF/IT spec, 7.2.6
Hex value not provided in TIFF/IT spec 7.2.6. Hex value determined by decimal converter tool.
34032
84F0
Comments welcome.
CMYKEquivalent
Specifies CMYK equivalent for specific separations.
TIFF/IT spec, 7.2.8.3.4
Hex value not provided in TIFF/IT spec 7.2.8.3.4. Hex value determined by decimal converter tool.
34033
84F1
Comments welcome.
Reserved
For future TIFF/IT use
TIFF/IT spec
Hex value not provided in TIFF/IT spec. Hex value determined by decimal converter tool.
34034
84F2
Comments welcome.
Reserved
For future TIFF/IT use
TIFF/IT spec
Hex value not provided in TIFF/IT spec. Hex value determined by decimal converter tool.
34035
84F3
Comments welcome.
Reserved
For future TIFF/IT use
TIFF/IT spec
Hex value not provided in TIFF/IT spec. Hex value determined by decimal converter tool.
34264
85D8
ModelTransformationTag
Used in interchangeable
GeoTIFF_1_0
files.
Private
In
GeoTIFF_1_0
, either this tag or 33922 must be defined, but not both
34377
8649
Photoshop
Collection of Photoshop 'Image Resource Blocks'.
Private
34665
8769
Exif IFD
A pointer to the Exif IFD.
Private
Also used by HD Photo.
For Exif, mandatory in primary TIFF IFD, if present.
34675
8773
InterColorProfile
ICC profile data.
TIFF/EP spec, p. 47
Exif private IFD
Also called
ICC Profile
Also used by HD Photo
34732
87AC
ImageLayer
Defined in the Mixed Raster Content part of RFC 2301, used to denote the particular function of this Image in the mixed raster scheme.
Extended
34735
87AF
GeoKeyDirectoryTag
Used in interchangeable
GeoTIFF_1_0
files.
Private
Mandatory in
GeoTIFF_1_0
34736
87B0
GeoDoubleParamsTag
Used in interchangeable
GeoTIFF_1_0
files.
Private
34737
87B1
GeoAsciiParamsTag
Used in interchangeable
GeoTIFF_1_0
files.
Private
34850
8822
ExposureProgram
The class of the program used by the camera to set exposure when the picture is taken.
Exif Private IFD
TIFF/EP spec, p. 41
34852
8824
SpectralSensitivity
Indicates the spectral sensitivity of each channel of the camera used.
Exif Private IFD
TIFF/EP spec, p. 48
34853
8825
GPSInfo
A pointer to the Exif-related GPS Info IFD.
TIFF/EP spec, p. 34
Exif private IFD
Also called
GPS IFD
34855
8827
ISOSpeedRatings
Indicates the ISO Speed and ISO Latitude of the camera or input device as specified in ISO 12232.
Exif Private IFD
TIFF/EP spec, p. 47
34856
8828
OECF
Indicates the Opto-Electric Conversion Function (OECF) specified in ISO 14524.
Exif Private IFD
TIFF/EP spec, p. 48
34857
8829
Interlace
Indicates the field number of multifield images.
TIFF/EP spec, p. 22
Exif private IFD
34858
882A
TimeZoneOffset
Encodes time zone of camera clock relative to GMT.
TIFF/EP spec, p. 38
Exif private IFD
34859
882B
SelfTimeMode
Number of seconds image capture was delayed from button press.
TIFF/EP spec, p. 45
Exif private IFD
34864
8830
SensitivityType
The SensitivityType tag indicates PhotographicSensitivity tag, which one of the parameters of ISO 12232. Although it is an optional tag, it should be recorded when a PhotographicSensitivity tag is recorded. Value = 4, 5, 6, or 7 may be used in case that the values of plural parameters are the same.
Exif private IFD
34865
8831
StandardOutputSensitivity
This tag indicates the standard output sensitivity value of a camera or input device defined in ISO 12232. When recording this tag, the PhotographicSensitivity and SensitivityType tags shall also be recorded.
Exif private IFD
34866
8832
RecommendedExposureIndex
This tag indicates the recommended exposure index value of a camera or input device defined in ISO 12232. When recording this tag, the PhotographicSensitivity and SensitivityType tags shall also be recorded.
Exif private IFD
34867
8833
ISOSpeed
This tag indicates the ISO speed value of a camera or input device that is defined in ISO 12232. When recording this tag, the PhotographicSensitivity and SensitivityType tags shall also be recorded.
Exif private IFD
34868
8834
ISOSpeedLatitudeyyy
This tag indicates the ISO speed latitude yyy value of a camera or input device that is defined in ISO 12232. However, this tag shall not be recorded without ISOSpeed and ISOSpeedLatitudezzz.
Exif private IFD
34869
8835
ISOSpeedLatitudezzz
This tag indicates the ISO speed latitude zzz value of a camera or input device that is defined in ISO 12232. However, this tag shall not be recorded without ISOSpeed and ISOSpeedLatitudeyyy.
Exif private IFD
34908
885C
HylaFAX FaxRecvParams
Used by HylaFAX.
Private
34909
885D
HylaFAX FaxSubAddress
Used by HylaFAX.
Private
34910
885E
HylaFAX FaxRecvTime
Used by HylaFAX.
Private
36864
9000
ExifVersion
The version of the supported Exif standard.
Exif Private IFD
Mandatory in the Exif IFD.
36867
9003
DateTimeOriginal
The date and time when the original image data was generated.
Exif Private IFD
TIFF/EP spec, p. 37
Mandatory for TIFF/EP.
36868
9004
DateTimeDigitized
The date and time when the image was stored as digital data.
Exif Private IFD
37121
9101
ComponentsConfiguration
Specific to compressed data; specifies the channels and complements PhotometricInterpretation
Exif Private IFD
37122
9102
CompressedBitsPerPixel
Specific to compressed data; states the compressed bits per pixel.
Exif Private IFD
TIFF/EP spec, p. 27
37377
9201
ShutterSpeedValue
Shutter speed.
Exif Private IFD
TIFF/EP spec, p. 39
37378
9202
ApertureValue
The lens aperture.
Exif Private IFD
TIFF/EP spec, p. 39
37379
9203
BrightnessValue
The value of brightness.
Exif Private IFD
TIFF/EP spec, p. 40
37380
9204
ExposureBiasValue
The exposure bias.
Exif Private IFD
TIFF/EP spec, p. 40
37381
9205
MaxApertureValue
The smallest F number of the lens.
Exif Private IFD
TIFF/EP spec, p. 40
37382
9206
SubjectDistance
The distance to the subject, given in meters.
Exif Private IFD
TIFF/EP spec, p. 44
37383
9207
MeteringMode
The metering mode.
Exif Private IFD
TIFF/EP spec, p. 41
37384
9208
LightSource
The kind of light source.
Exif Private IFD
TIFF/EP spec, p. 46
37385
9209
Flash
Indicates the status of flash when the image was shot.
Exif Private IFD
TIFF/EP spec, p. 42
37386
920A
FocalLength
The actual focal length of the lens, in mm.
Exif Private IFD
TIFF/EP spec, p. 44
37387
920B
FlashEnergy
Amount of flash energy (BCPS).
TIFF/EP spec, p. 43
Exif Private IFD
37388
920C
SpatialFrequencyResponse
SFR of the camera.
TIFF/EP spec, p. 49
Exif Private IFD
37389
920D
Noise
Noise measurement values.
TIFF/EP spec, p. 49
Exif Private IFD
37390
920E
FocalPlaneXResolution
Number of pixels per FocalPlaneResolutionUnit (37392) in ImageWidth direction for main image.
TIFF/EP spec, p. 18
Exif Private IFD
37391
920F
FocalPlaneYResolution
Number of pixels per FocalPlaneResolutionUnit (37392) in ImageLength direction for main image.
TIFF/EP spec, p. 19
Exif Private IFD
37392
9210
FocalPlaneResolutionUnit
Unit of measurement for FocalPlaneXResolution(37390) and FocalPlaneYResolution(37391).
TIFF/EP spec, p. 19
Exif Private IFD
37393
9211
ImageNumber
Number assigned to an image, e.g., in a chained image burst.
TIFF/EP spec, p. 32
Exif Private IFD
37394
9212
SecurityClassification
Security classification assigned to the image.
TIFF/EP spec, p. 33
Exif Private IFD
37395
9213
ImageHistory
Record of what has been done to the image.
TIFF/EP spec, p. 33
Exif Private IFD
37396
9214
SubjectLocation
Indicates the location and area of the main subject in the overall scene.
Exif Private IFD
TIFF/EP spec, p. 45
Called SubjectArea (from Exif spec) at AWare Web site
37397
9215
ExposureIndex
Encodes the camera exposure index setting when image was captured.
TIFF/EP spec, p. 47
Exif Private IFD
37398
9216
TIFF/EPStandardID
For current spec, tag value equals
1 0 0 0
TIFF/EP spec, p. 16
Exif Private IFD
Mandatory in TIFF/EP.
37399
9217
SensingMethod
Type of image sensor.
TIFF/EP spec, p. 22
Exif Private IFD
Mandatory in TIFF/EP.
37500
927C
MakerNote
Manufacturer specific information.
Exif Private IFD
37510
9286
UserComment
Keywords or comments on the image; complements ImageDescription.
Exif Private IFD
37520
9290
SubsecTime
A tag used to record fractions of seconds for the DateTime tag.
Exif Private IFD
37521
9291
SubsecTimeOriginal
A tag used to record fractions of seconds for the DateTimeOriginal tag.
Exif Private IFD
37522
9292
SubsecTimeDigitized
A tag used to record fractions of seconds for the DateTimeDigitized tag.
Exif Private IFD
37724
935C
ImageSourceData
Used by Adobe Photoshop.
Private
40091
9c9b
XPTitle
Title tag used by Windows, encoded in UCS2
Exif Private IFD
40092
9c9c
XPComment
Comment tag used by Windows, encoded in UCS2
Exif Private IFD
40093
9c9d
XPAuthor
Author tag used by Windows, encoded in UCS2
Exif Private IFD
40094
9c9e
XPKeywords
Keywords tag used by Windows, encoded in UCS2
Exif Private IFD
40095
9c9f
XPSubject
Subject tag used by Windows, encoded in UCS2
Exif Private IFD
40960
A000
FlashpixVersion
The Flashpix format version supported by a FPXR file.
Exif Private IFD
Mandatory in the Exif IFD
40961
A001
ColorSpace
The color space information tag is always recorded as the color space specifier.
Exif Private IFD
Mandatory in the Exif IFD
40962
A002
PixelXDimension
Specific to compressed data; the valid width of the meaningful image.
Exif Private IFD
40963
A003
PixelYDimension
Specific to compressed data; the valid height of the meaningful image.
Exif Private IFD
40964
A004
RelatedSoundFile
Used to record the name of an audio file related to the image data.
Exif Private IFD
40965
A005
Interoperability IFD
A pointer to the Exif-related Interoperability IFD.
Private
41483
A20B
FlashEnergy
Indicates the strobe energy at the time the image is captured, as measured in Beam Candle Power Seconds
Exif Private IFD
41484
A20C
SpatialFrequencyResponse
Records the camera or input device spatial frequency table and SFR values in the direction of image width, image height, and diagonal direction, as specified in ISO 12233.
Exif Private IFD
41486
A20E
FocalPlaneXResolution
Indicates the number of pixels in the image width (X) direction per FocalPlaneResolutionUnit on the camera focal plane.
Exif Private IFD
41487
A20F
FocalPlaneYResolution
Indicates the number of pixels in the image height (Y) direction per FocalPlaneResolutionUnit on the camera focal plane.
Exif Private IFD
41488
A210
FocalPlaneResolutionUnit
Indicates the unit for measuring FocalPlaneXResolution and FocalPlaneYResolution.
Exif Private IFD
41492
A214
SubjectLocation
Indicates the location of the main subject in the scene.
Exif Private IFD
41493
A215
ExposureIndex
Indicates the exposure index selected on the camera or input device at the time the image is captured.
Exif Private IFD
41495
A217
SensingMethod
Indicates the image sensor type on the camera or input device.
Exif Private IFD
41728
A300
FileSource
Indicates the image source.
Exif Private IFD
41729
A301
SceneType
Indicates the type of scene.
Exif Private IFD
41730
A302
CFAPattern
Indicates the color filter array (CFA) geometric pattern of the image sensor when a one-chip color area sensor is used.
Exif Private IFD
41985
A401
CustomRendered
Indicates the use of special processing on image data, such as rendering geared to output.
Exif Private IFD
41986
A402
ExposureMode
Indicates the exposure mode set when the image was shot.
Exif Private IFD
41987
A403
WhiteBalance
Indicates the white balance mode set when the image was shot.
Exif Private IFD
41988
A404
DigitalZoomRatio
Indicates the digital zoom ratio when the image was shot.
Exif Private IFD
41989
A405
FocalLengthIn35mmFilm
Indicates the equivalent focal length assuming a 35mm film camera, in mm.
Exif Private IFD
41990
A406
SceneCaptureType
Indicates the type of scene that was shot.
Exif Private IFD
41991
A407
GainControl
Indicates the degree of overall image gain adjustment.
Exif Private IFD
41992
A408
Contrast
Indicates the direction of contrast processing applied by the camera when the image was shot.
Exif Private IFD
41993
A409
Saturation
Indicates the direction of saturation processing applied by the camera when the image was shot.
Exif Private IFD
41994
A40A
Sharpness
Indicates the direction of sharpness processing applied by the camera when the image was shot.
Exif Private IFD
41995
A40B
DeviceSettingDescription
This tag indicates information on the picture-taking conditions of a particular camera model.
Exif Private IFD
41996
A40C
SubjectDistanceRange
Indicates the distance to the subject.
Exif Private IFD
42016
A420
ImageUniqueID
Indicates an identifier assigned uniquely to each image.
Exif Private IFD
42032
a430
CameraOwnerName
Camera owner name as ASCII string.
Exif Private IFD
42033
a431
BodySerialNumber
Camera body serial number as ASCII string.
Exif Private IFD
42034
a432
LensSpecification
This tag notes minimum focal length, maximum focal length, minimum F number in the minimum focal length, and minimum F number in the maximum focal length, which are specification information for the lens that was used in photography. When the minimum F number is unknown, the notation is 0/0.
Exif Private IFD
42035
a433
LensMake
Lens manufacturer name as ASCII string.
Exif Private IFD
42036
a434
LensModel
Lens model name and number as ASCII string.
Exif Private IFD
42037
a435
LensSerialNumber
Lens serial number as ASCII string.
Exif Private IFD
42112
A480
GDAL_METADATA
Used by the GDAL library, holds an XML list of name=value 'metadata' values about the image as a whole, and about specific samples.
Private
42113
A481
GDAL_NODATA
Used by the GDAL library, contains an ASCII encoded nodata or background pixel value.
Private
48129
BC01
PixelFormat
A 128-bit Globally Unique Identifier (GUID) that identifies the image pixel format.
HD Photo Feature Spec
, p. 17
48130
BC02
Transformation
Specifies the transformation to be applied when decoding the image to present the desired representation.
HD Photo Feature Spec
, p. 23
48131
BC03
Uncompressed
Specifies that image data is uncompressed.
HD Photo Feature Spec
, p. 23
48132
BC04
ImageType
Specifies the image type of each individual frame in a multi-frame file.
HD Photo Feature Spec
, p. 27
48256
BC80
ImageWidth
Specifies the number of columns in the transformed photo, or the number of pixels per scan line.
HD Photo Feature Spec
, p. 21
48257
BC81
ImageHeight
Specifies the number of pixels or scan lines in the transformed photo.
HD Photo Feature Spec
, p. 21
48258
BC82
WidthResolution
Specifies the horizontal resolution of a transformed image expressed in pixels per inch.
HD Photo Feature Spec
, p. 21
48259
BC83
HeightResolution
Specifies the vertical resolution of a transformed image expressed in pixels per inch.
HD Photo Feature Spec
, p. 21
48320
BCC0
ImageOffset
Specifies the byte offset pointer to the beginning of the photo data, relative to the beginning of the file.
HD Photo Feature Spec
, p. 22
48321
BCC1
ImageByteCount
Specifies the size of the photo in bytes.
HD Photo Feature Spec
, p. 22
48322
BCC2
AlphaOffset
Specifies the byte offset pointer the beginning of the planar alpha channel data, relative to the beginning of the file.
HD Photo Feature Spec
, p. 22
48323
BCC3
AlphaByteCount
Specifies the size of the alpha channel data in bytes.
HD Photo Feature Spec
, p. 23
48324
BCC4
ImageDataDiscard
Signifies the level of data that has been discarded from the image as a result of a compressed domain transcode to reduce the file size.
HD Photo Feature Spec
, p. 25
48325
BCC5
AlphaDataDiscard
Signifies the level of data that has been discarded from the planar alpha channel as a result of a compressed domain transcode to reduce the file size.
HD Photo Feature Spec
, p. 26
50215
C427
Oce Scanjob Description
Used in the Oce scanning process.
Private
50216
C428
Oce Application Selector
Used in the Oce scanning process.
Private
50217
C429
Oce Identification Number
Used in the Oce scanning process.
Private
50218
C42A
Oce ImageLogic Characteristics
Used in the Oce scanning process.
Private
50341
c4a5
PrintImageMatching
Description needed.
Exif Private IFD
50706
C612
DNGVersion
Encodes DNG four-tier version number; for version 1.1.0.0, the tag

contains the bytes
1, 1, 0, 0
. Used in IFD 0 of DNG files.
DNG spec
(1.3, 2009), p. 17
Exif Private IFD
50707
C613
DNGBackwardVersion
Defines oldest version of spec with which file is compatible. Used

in IFD 0 of DNG files.
DNG spec
(1.3, 2009), p. 17
Exif Private IFD
50708
C614
UniqueCameraModel
Unique, non-localized nbame for camera model. Used in IFD 0 of DNG

files.
DNG spec
(1.3, 2009), p. 18
Exif Private IFD
50709
C615
LocalizedCameraModel
Similar to 50708, with localized camera name. Used in IFD 0 of DNG

files.
DNG spec
(1.3, 2009), p. 19
Exif Private IFD
50710
C616
CFAPlaneColor
Mapping between values in the CFAPattern tag and the plane numbers

in LinearRaw space. Used in Raw IFD of DNG files.
DNG spec
(1.3, 2009), p. 19
Exif Private IFD
Required for non-RGB CFA images.
50711
C617
CFALayout
Spatial layout of the CFA. Used in Raw IFD of DNG files.
DNG spec
(1.3, 2009), p. 20
Exif Private IFD
50712
C618
LinearizationTable
Lookup table that maps stored values to linear values. Used in Raw

IFD of DNG files.
DNG spec
(1.3, 2009), p. 21
Exif Private IFD
50713
C619
BlackLevelRepeatDim
Repeat pattern size for BlackLevel tag. Used in Raw IFD of DNG files.
DNG spec
(1.3, 2009), p. 21
Exif Private IFD
50714
C61A
BlackLevel
Specifies the zero light encoding level.Used in Raw IFD of DNG files.
DNG spec
(1.3, 2009), p. 22
Exif Private IFD
50715
C61B
BlackLevelDeltaH
Specifies the difference between zero light encoding level for each

column and the baseline zero light encoding level. Used in Raw IFD

of DNG files.
DNG spec
(1.3, 2009), p. 22
Exif Private IFD
50716
C61C
BlackLevelDeltaV
Specifies the difference between zero light encoding level for each

row and the baseline zero light encoding level. Used in Raw IFD of

DNG files.
DNG spec
(1.3, 2009), p. 23
Exif Private IFD
50717
C61D
WhiteLevel
Specifies the fully saturated encoding level for the raw sample

values. Used in Raw IFD of DNG files.
DNG spec
(1.3, 2009), p. 24
Exif Private IFD
50718
C61E
DefaultScale
For cameras with non-square pixels, specifies the default scale

factors for each direction to convert the image to square pixels.

Used in Raw IFD of DNG files.
DNG spec
(1.3, 2009), p. 24
Exif Private IFD
50719
C61F
DefaultCropOrigin
Specifies the origin of the final image area, ignoring the extra

pixels at edges used to prevent interpolation artifacts. Used in Raw

IFD of DNG files.
DNG spec
(1.3, 2009), p. 25
Exif Private IFD
50720
C620
DefaultCropSize
Specifies size of final image area in raw image coordinates. Used

in Raw IFD of DNG files.
DNG spec
(1.3, 2009), p. 26
Exif Private IFD
50721
C621
ColorMatrix1
Defines a transformation matrix that converts XYZ values to reference

camera native color space values, under the first calibration illuminant.

Used in IFD 0 of DNG files.
DNG spec
(1.3, 2009), p. 27
Exif Private IFD
50722
C622
ColorMatrix2
Defines a transformation matrix that converts XYZ values to reference

camera native color space values, under the second calibration illuminant.

Used in IFD 0 of DNG files.
DNG spec
(1.3, 2009), p. 28
Exif Private IFD
50723
C623
CameraCalibration1
Defines a calibration matrix that transforms reference camera native

space values to individual camera native space values under the first

calibration illuminant. Used in IFD 0 of DNG files.
DNG spec
(1.3, 2009), p. 28
Exif Private IFD
50724
C624
CameraCalibration2
Defines a calibration matrix that transforms reference camera native

space values to individual camera native space values under the second

calibration illuminant. Used in IFD 0 of DNG files.
DNG spec
(1.3, 2009), p. 29
Exif Private IFD
50725
C625
ReductionMatrix1
Defines a dimensionality reduction matrix for use as the first stage

in converting color camera native space values to XYZ values, under

the first calibration illuminant. Used in IFD 0 of DNG files.
DNG spec
(1.3, 2009), p. 30
Exif Private IFD
50726
C626
ReductionMatrix2
Defines a dimensionality reduction matrix for use as the first stage

in converting color camera native space values to XYZ values, under

the second calibration illuminant. Used in IFD 0 of DNG files.
DNG spec
(1.3, 2009), p. 30
Exif Private IFD
50727
C627
AnalogBalance
Pertaining to white balance, defines the gain, either analog or

digital, that has been applied to the stored raw values. Used in IFD

0 of DNG files.
DNG spec
(1.3, 2009), p. 31
Exif Private IFD
50728
C628
AsShotNeutral
Specifies the selected white balance at the time of capture, encoded

as the coordinates of a perfectly neutral color in linear reference

space values. Used in IFD 0 of DNG files.
DNG spec
(1.3, 2009), p. 31
Exif Private IFD
50729
C629
AsShotWhiteXY
Specifies the selected white balance at the time of capture, encoded

as x-y chromaticity coordinates. Used in IFD 0 of DNG files.
DNG spec
(1.3, 2009), p. 32
Exif Private IFD
50730
C62A
BaselineExposure
Specifies in EV units how much to move the zero point for exposure

compensation. Used in IFD 0 of DNG files.
DNG spec
(1.3, 2009), p. 32
Exif Private IFD
50731
C62B
BaselineNoise
Specifies the relative noise of the camera model at a baseline ISO

value of 100, compared to reference camera model. Used in IFD 0 of

DNG files.
DNG spec
(1.3, 2009), p. 33
Exif Private IFD
50732
C62C
BaselineSharpness
Specifies the relative amount of sharpening required for this camera

model, compared to reference camera model. Used in IFD 0 of DNG files.
DNG spec
(1.3, 2009), p. 33
Exif Private IFD
50733
C62D
BayerGreenSplit
For CFA images, specifies, in arbitrary units, how closely the values

of the green pixels in the blue/green rows track the values of the

green pixels in the red/green rows. Used in Raw IFD of DNG files.
DNG spec
(1.3, 2009), p. 34
Exif Private IFD
50734
C62E
LinearResponseLimit
Specifies the fraction of the encoding range above which the response

may become significantly non-linear. Used in IFD 0 of DNG files.
DNG spec
(1.3, 2009), p. 34
Exif Private IFD
50735
C62F
CameraSerialNumber
Serial number of camera. Used in IFD 0 of DNG files.
DNG spec
(1.3, 2009), p. 35
Exif Private IFD
50736
C630
LensInfo
Information about the lens. Used in IFD 0 of DNG files.
DNG spec
(1.3, 2009), p. 35
Exif Private IFD
50737
C631
ChromaBlurRadius
Normally for non-CFA images, provides a hint about how much chroma

blur ought to be applied. Used in Raw IFD of DNG files.
DNG spec
(1.3, 2009), p. 36
Exif Private IFD
50738
C632
AntiAliasStrength
Provides a hint about the strength of the camera's anti-aliasing

filter. Used in Raw IFD of DNG files.
DNG spec
(1.3, 2009), p. 36
Exif Private IFD
50739
ShadowScale
Used by Adobe Camera Raw to control sensitivity of its shadows slider.

Used in IFD 0 of DNG files.
DNG spec
(1.3, 2009), p. 37
Exif Private IFD
50740
C634
DNGPrivateData
Provides a way for camera manufacturers to store private data in

DNG files for use by their own raw convertors. Used in IFD 0 of DNG

files.
DNG spec
(1.3, 2009), p. 37
Exif Private IFD
50741
C635
MakerNoteSafety
Lets the DNG reader know whether the Exif MakerNote tag is safe

to preserve. Used in IFD 0 of DNG files.
DNG spec
(1.3, 2009), p. 38
Exif Private IFD
50778
C65A
CalibrationIlluminant1
Illuminant used for first set of calibration tags. Used in IFD 0

of DNG files.
DNG spec
(1.3, 2009), p. 26
Exif Private IFD
50779
C65B
CalibrationIlluminant2
Illuminant used for second set of calibration tags. Used in IFD

0 of DNG files.
DNG spec
(1.3, 2009), p. 27
Exif Private IFD
50780
C65C
BestQualityScale
Specifies the amount by which the values of the DefaultScale tag

need to be multiplied to achieve best quality image size. Used in

Raw IFD of DNG files.
DNG spec
(1.3, 2009), p. 25
Exif Private IFD
50781
RawDataUniqueID
Contains a 16-byte unique identifier for the raw image file in the

DNG file. Used in IFD 0 of DNG files.
DNG spec
(1.3, 2009), p. 39
Exif Private IFD
50784
C660
Alias Layer Metadata
Alias Sketchbook Pro layer usage description.
Private
50827
OriginalRawFileName
Name of original file if the DNG file results from conversion from

a non-DNG raw file. Used in IFD 0 of DNG files.
DNG spec
(1.3, 2009), p. 39
Exif Private IFD
50828
OriginalRawFileData
If the DNG file was converted from a non-DNG raw file, then this

tag contains the original raw data. Used in IFD 0 of DNG files.
DNG spec
(1.3, 2009), p. 40
Exif Private IFD
50829
ActiveArea
Defines the active (non-masked) pixels of the sensor. Used in Raw

IFD of DNG files.
DNG spec
(1.3, 2009), p. 41
Exif Private IFD
50830
MaskedAreas
List of non-overlapping rectangle coordinates of fully masked pixels,

which can optimally be used by DNG readers to measure the black encoding

level. Used in Raw IFD of DNG files.
DNG spec
(1.3, 2009), p. 42
Exif Private IFD
50831
AsShotICCProfile
Contains ICC profile that, in conjunction with the AsShotPreProfileMatrix

tag, specifies a default color rendering from camera color space coordinates

(linear reference values) into the ICC profile connection space. Used

in IFD 0 of DNG files.
DNG spec
(1.3, 2009), p. 42
Exif Private IFD
50832
AsShotPreProfileMatrix
Specifies a matrix that should be applied to the camera color space

coordinates before processing the values through the ICC profile specified

in the AsShotICCProfile tag. Used in IFD 0 of DNG files.
DNG spec
(1.3, 2009), p. 43
Exif Private IFD
50833
CurrentICCProfile
The CurrentICCProfile and CurrentPreProfileMatrix tags have the

same purpose and usage as
the AsShotICCProfile and AsShotPreProfileMatrix tag pair, except they

are for use by raw file
editors rather than camera manufacturers. Used in IFD 0 of DNG files.
DNG spec
(1.3, 2009), p. 44
Exif Private IFD
50834
CurrentPreProfileMatrix
The CurrentICCProfile and CurrentPreProfileMatrix tags have the

same purpose and usage as
the AsShotICCProfile and AsShotPreProfileMatrix tag pair, except they

are for use by raw file
editors rather than camera manufacturers. Used in IFD 0 of DNG files.
DNG spec
(1.3, 2009), p. 44
Exif Private IFD
50879
C6BF
ColorimetricReference
The DNG color model documents a transform between camera colors and CIE XYZ values. This tag describes the colorimetric reference for the CIE XYZ values. 0 = The XYZ values are scene-referred. 1 = The XYZ values are output-referred, using the ICC profile perceptual dynamic range. Used in IFD 0 of DNG files.
DNG spec
(1.3, 2009), p. 45
Exif Private IFD
50931
C6F3
CameraCalibrationSignature
A UTF-8 encoded string associated with the CameraCalibration1 and CameraCalibration2 tags. Used in IFD 0 of DNG files.
DNG spec
(1.3, 2009), p. 46
Exif Private IFD
50932
C6F4
ProfileCalibrationSignature
A UTF-8 encoded string associated with the camera profile tags. Used in IFD 0 or CameraProfile IFD of DNG files.
DNG spec
(1.3, 2009), p. 46
Exif Private IFD
50933
C6F5
ExtraCameraProfiles
A list of file offsets to extra Camera Profile IFDs. The format of a camera profile begins with a 16-bit byte order mark (MM or II) followed by a 16-bit "magic" number equal to 0x4352 (CR), a 32-bit IFD offset, and then a standard TIFF format IFD. Used in IFD 0 of DNG files.
DNG spec
(1.3, 2009), p. 47
50934
C6F6
AsShotProfileName
A UTF-8 encoded string containing the name of the "as shot" camera profile, if any. Used in IFD 0 of DNG files.
DNG spec
(1.3, 2009), p. 47
Exif Private IFD
50935
C6F7
NoiseReductionApplied
Indicates how much noise reduction has been applied to the raw data on a scale of 0.0 to 1.0. A 0.0 value indicates that no noise reduction has been applied. A 1.0 value indicates that the "ideal" amount of noise reduction has been applied, i.e. that the DNG reader should not apply additional noise reduction by default. A value of 0/0 indicates that this parameter is unknown. Used in Raw IFD of DNG files.
DNG spec
(1.3, 2009), p. 48
Exif Private IFD
50936
C6F8
ProfileName
A UTF-8 encoded string containing the name of the camera profile. Used in IFD 0 or Camera Profile IFD of DNG files.
DNG spec
(1.3, 2009), p. 48
Exif Private IFD
50937
C6F9
ProfileHueSatMapDims
Specifies the number of input samples in each dimension of the hue/saturation/value mapping tables. The data for these tables are stored in ProfileHueSatMapData1 and ProfileHueSatMapData2 tags. Allowed values include the following: HueDivisions >= 1; SaturationDivisions >= 2; ValueDivisions >=1. Used in IFD 0 or Camera Profile IFD of DNG files.
DNG spec
(1.3, 2009), p. 49
Exif Private IFD
50938
C6FA
ProfileHueSatMapData1
Contains the data for the first hue/saturation/value mapping table. Each entry of the table contains three 32-bit IEEE floating-point values. The first entry is hue shift in degrees; the second entry is saturation scale factor; and the third entry is a value scale factor. Used in IFD 0 or Camera Profile IFD of DNG files.
DNG spec
(1.3, 2009), p. 50
Exif Private IFD
50939
C6FB
ProfileHueSatMapData2
Contains the data for the second hue/saturation/value mapping table. Each entry of the table contains three 32-bit IEEE floating-point values. The first entry is hue shift in degrees; the second entry is saturation scale factor; and the third entry is a value scale factor. Used in IFD 0 or Camera Profile IFD of DNG files.
DNG spec
(1.3, 2009), p. 50-1
Exif Private IFD
50940
C6FC
ProfileToneCurve
Contains a default tone curve that can be applied while processing the image as a starting point for user adjustments. The curve is specified as a list of 32-bit IEEE floating-point value pairs in linear gamma. Each sample has an input value in the range of 0.0 to 1.0, and an output value in the range of 0.0 to 1.0. The first sample is required to be (0.0, 0.0), and the last sample is required to be (1.0, 1.0). Interpolated the curve using a cubic spline. Used in IFD 0 or Camera Profile IFD of DNG files.
DNG spec
(1.3, 2009), p. 51
Exif Private IFD
50941
C6FD
ProfileEmbedPolicy
Contains information about the usage rules for the associated camera profile. The valid values and meanings are: 0 = �allow copying�; 1 = �embed if used�; 2 = �embed never�; and 3 = �no restrictions�. Used in IFD 0 or Camera Profile IFD of DNG files.
DNG spec
(1.3, 2009), p. 52
Exif Private IFD
50942
C6FE
ProfileCopyright
Contains information about the usage rules for the associated camera profile. The valid values and meanings are: 0 = �allow copying�; 1 = �embed if used�; 2 = �embed never�; and 3 = �no restrictions�. Used in IFD 0 or Camera Profile IFD of DNG files.
DNG spec
(1.3, 2009), p. 52
Exif Private IFD
50964
C714
ForwardMatrix1
Defines a matrix that maps white balanced camera colors to XYZ D50 colors. Used in IFD 0 or Camera Profile IFD of DNG files.
DNG spec
(1.3, 2009), p. 53
Exif Private IFD
50965
C715
ForwardMatrix2
Defines a matrix that maps white balanced camera colors to XYZ D50 colors. Used in IFD 0 or Camera Profile IFD of DNG files.
DNG spec
(1.3, 2009), p. 54
Exif Private IFD
50966
C716
PreviewApplicationName
A UTF-8 encoded string containing the name of the application that created the preview stored in the IFD. Used in Preview IFD of DNG files.
DNG spec
(1.3, 2009), p. 54
Exif Private IFD
50967
C717
PreviewApplicationVersion
A UTF-8 encoded string containing the version number of the application that created the preview stored in the IFD. Used in Preview IFD of DNG files.
DNG spec
(1.3, 2009), p. 55
Exif Private IFD
50968
C718
PreviewSettingsName
A UTF-8 encoded string containing the name of the conversion settings (for example, snapshot name) used for the preview stored in the IFD. Used in Preview IFD of DNG files.
DNG spec
(1.3, 2009), p. 55
Exif Private IFD
50969
C719
PreviewSettingsDigest
A unique ID of the conversion settings (for example, MD5 digest) used to render the preview stored in the IFD. Used in Preview IFD of DNG files.
DNG spec
(1.3, 2009), p. 56
Exif Private IFD
50970
C71A
PreviewColorSpace
This tag specifies the color space in which the rendered preview in this IFD is stored. The valid values include: 0 = Unknown; 1 = Gray Gamma 2.2; 2 = sRGB; 3 = Adobe RGB; and 4 = ProPhoto RGB. Used in Preview IFD of DNG files.
DNG spec
(1.3, 2009), p. 56
Exif Private IFD
50971
C71B
PreviewDateTime
This tag is an ASCII string containing the name of the date/time at which the preview stored in the IFD was rendered, encoded using ISO 8601 format. Used in Preview IFD of DNG files.
DNG spec
(1.3, 2009), p. 57
Exif Private IFD
50972
C71C
RawImageDigest
MD5 digest of the raw image data. All pixels in the image are processed in row-scan order. Each pixel is zero padded to 16 or 32 bits deep (16-bit for data less than or equal to 16 bits deep, 32-bit otherwise). The data is processed in little-endian byte order. Used in IFD 0 of DNG files.
DNG spec
(1.3, 2009), p. 57
Exif Private IFD
50973
C71D
OriginalRawFileDigest
MD5 digest of the data stored in the OriginalRawFileData tag. Used in IFD 0 of DNG files.
DNG spec
(1.3, 2009), p. 58
Exif Private IFD
50974
C71E
SubTileBlockSize
Normally, pixels within a tile are stored in simple row-scan order. This tag specifies that the pixels within a tile should be grouped first into rectangular blocks of the specified size. These blocks are stored in row-scan order. Within each block, the pixels are stored in row-scan order. Used in Raw IFD of DNG files.
DNG spec
(1.3, 2009), p. 58
Exif Private IFD
50975
C71F
RowInterleaveFactor
Specifies that rows of the image are stored in interleaved order. The value of the tag specifies the number of interleaved fields. Used in Raw IFD of DNG files.
DNG spec
(1.3, 2009), p. 59
Exif Private IFD
50981
C725
ProfileLookTableDims
Specifies the number of input samples in each dimension of a default "look" table. The data for this table is stored in the ProfileLookTableData tag. Allowed values include: HueDivisions >= 1; SaturationDivisions >= 2; and ValueDivisions >= 1. Used in IFD 0 or Camera Profile IFD of DNG files.
DNG spec
(1.3, 2009), p. 59
Exif Private IFD
50982
C726
ProfileLookTableData
Default "look" table that can be applied while processing the image as a starting point for user adjustment. This table uses the same format as the tables stored in the ProfileHueSatMapData1 and ProfileHueSatMapData2 tags, and is applied in the same color space. However, it should be applied later in the processing pipe, after any exposure compensation and/or fill light stages, but before any tone curve stage. Each entry of the table contains three 32-bit IEEE floating-point values. The first entry is hue shift in degrees, the second entry is a saturation scale factor, and the third entry is a value scale factor. Used in IFD 0 or Camera Profile IFD of DNG files.
DNG spec
(1.3, 2009), p. 60
Exif Private IFD
51008
C740
OpcodeList1
Specifies the list of opcodes (image processing operation codes) that should be applied to the raw image, as read directly from the file. Used in Raw IFD of DNG files.
DNG spec
(1.3, 2009), p. 61
Exif Private IFD
51009
C741
OpcodeList2
Specifies the list of opcodes (image processing operation codes) that should be applied to the raw image, just after it has been mapped to linear reference values. Used in Raw IFD of DNG files.
DNG spec
(1.3, 2009), p. 61
Exif Private IFD
51022
C74E
OpcodeList3
Specifies the list of opcodes (image processing operation codes) that should be applied to the raw image, just after it has been demosaiced. Used in Raw IFD of DNG files.
DNG spec
(1.3, 2009), p. 62
Exif Private IFD
51041
C761
NoiseProfile
Describes the amount of noise in a raw image; models the amount of signal-dependent photon (shot) noise and signal-independent sensor readout noise, two common sources of noise in raw images. Used in Raw IFD of DNG files.
DNG spec
(1.3, 2009), p. 62-3
Exif Private IFD
51089
C791
OriginalDefaultFinalSize
If this file is a proxy for a larger original DNG file, this tag specifics the default final size of the larger original file from which this proxy was generated. The default value for this tag is default final size
of the current DNG file, which is DefaultCropSize * DefaultScale.
DNG spec
(1.4, 2012), p. 74
51090
C792
OriginalBestQualityFinalSize
If this file is a proxy for a larger original DNG file, this tag specifics the best quality final size of the larger original file from which this proxy was generated. The default value for this tag is the OriginalDefaultFinalSize, if specified. Otherwise the default value for this tag is the best quality size of the current DNG file, which is DefaultCropSize * DefaultScale * BestQualityScale.
DNG spec
(1.4, 2012), p. 75
51091
C793
OriginalDefaultCropSize
If this file is a proxy for a larger original DNG file, this tag specifics the DefaultCropSize of the larger original file from
which this proxy was generated. The default value for this tag is the OriginalDefaultFinalSize, if specified. Otherwise, the default value for this tag is the DefaultCropSize of the current DNG file.
DNG spec
(1.4, 2012), p. 75
51107
C7A3
ProfileHueSatMapEncoding
Provides a way for color profiles to specify how indexing into a 3D HueSatMap is performed during raw conversion. This tag is not applicable to 2.5D HueSatMap tables (i.e., where the Value dimension is 1). The currently defined values are: 0 = Linear encoding (method described in DNG spec); 1 = sRGB encoding (method described in DNG spec).
DNG spec
(1.4, 2012), p. 73
51108
C7A4
ProfileLookTableEncoding
Provides a way for color profiles to specify how indexing into a 3D LookTable is performed during raw conversion. This tag is not applicable to a 2.5D LookTable (i.e., where the Value dimension is 1). The currently defined values are: 0 = Linear encoding (method described in DNG spec); 1 = sRGB encoding (method described in DNG spec).
DNG spec
(1.4, 2012), p. 72-3
51109
C7A5
BaselineExposureOffset
Provides a way for color profiles to increase
or decrease exposure during raw conversion. BaselineExposureOffset specifies the amount (in
EV units) to add to th
e BaselineExposure tag
during image rendering. For example, if the
BaselineExposure value fo
r a given camera model
is +0.3, and the BaselineExposureOffset value
for a given camera profile used to render an
image for that camera model is -0.7, then th
e actual default exposure value used during
rendering will be +0.3 - 0.7 = -0.4.
DNG spec
(1.4, 2012), p. 71
51110
C7A6
DefaultBlackRender
This optional tag in a color profile provides a hint to the raw converter regarding how to handle the black point (e.g., flare subtraction) during rendering. The currently defined values are: 0 = Auto; 1 = None. If set to Auto, the raw converter should perform black subtraction during rendering. The amount and method of black subtraction may be automatically determined and may be image-dependent. If set to None, the raw converter should not perform any black subtraction during rendering. This may be desirable when using color lookup tables (e.g., LookTable) or tone curves in camera profiles to perform a fixed, consistent level of black subtraction.
DNG spec
(1.4, 2012), p. 71
51111
C7A7
NewRawImageDigest
This tag is a modified MD5 digest of the raw image data. It has been updated from the algorithm used to compute the RawImageDigest tag be more multi-processor friendly, and to support lossy compression algorithms. The details of the algorithm used to compute this tag are documented in the Adobe DNG SDK source code.
DNG spec
(1.4, 2012), p. 76
51112
C7A8
RawToPreviewGain
The gain (what number the sample values are multiplied by) between the main raw IFD and the preview IFD containing this tag.
DNG spec
(1.4, 2012), p. 76
51125
C7B5
DefaultUserCrop
Specifies a default user crop rectangle in relative coordinates. The values must satisfy: 0.0 <= top < bottom <= 1.0; 0.0 <= left < right <= 1.0. The default values of (top = 0, left = 0, bottom = 1, right = 1) correspond exactly to the default crop rectangle (as specified by the DefaultCropOrigin and DefaultCropSize tags).
DNG spec
(1.4, 2012), p. 70
TIFF image classes are described in the 1992 TIFF

6.0
specification
and may be summarized as follows:
• Class B. Baseline bilevel.
• Class G. Baseline grayscale.
• Class P. Baseline palette-color.
• Class R. Baseline RGB.
• Class Y. Extension YCbCr.
The TIFF/IT specification (ISO 12639, 2004) defines the following image categories:
• CT. Color continuous-tone picture.
• LW. Color line art.
• HC. High-resolution continuous-tone.
• MP. Monochrome continuous-tone picture.
• BP. Binary picture.
• BL. Binary line art.
• SD. Screened data image.
• FP. Final page.
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