IPTC stands for "International Press Telecommunications Council". This is an older meta information format that is slowly being phased out in favor of XMP. IPTC information may be embedded in JPG, TIFF, PNG, MIFF, PS, PDF, PSD and DNG images.
The IPTC specification dictates a length for ASCII (string or digits)
values. These lengths are given in square brackets after the Writable
format name. For tags where a range of lengths is allowed, the minimum and
maximum lengths are separated by a comma within the brackets. IPTC strings
are not null terminated.
IPTC information is separated into different records, each of which has its own set of tags.
Record Tag Name Writable Values / Notes 1 IPTCEnvelope - --> IPTC EnvelopeRecord Tags 2 IPTCApplication - --> IPTC ApplicationRecord Tags 3 IPTCNewsPhoto - --> IPTC NewsPhoto Tags 7 IPTCPreObjectData - --> IPTC PreObjectData Tags 8 IPTCObjectData - --> IPTC ObjectData Tags 9 IPTCPostObjectData - --> IPTC PostObjectData Tags
Tag ID Tag Name Writable Values / Notes 0 EnvelopeRecordVersion int16u 5 Destination string[0,1024]+ 20 FileFormat int16u 0 = No ObjectData
1 = IPTC-NAA Digital Newsphoto Parameter Record
2 = IPTC7901 Recommended Message Format
3 = Tagged Image File Format (Adobe/Aldus Image data)
4 = Illustrator (Adobe Graphics data)
5 = AppleSingle (Apple Computer Inc)
6 = NAA 89-3 (ANPA 1312)
7 = MacBinary II
8 = IPTC Unstructured Character Oriented File Format (UCOFF)
9 = United Press International ANPA 1312 variant
10 = United Press International Down-Load Message
11 = JPEG File Interchange (JFIF)
12 = Photo-CD Image-Pac (Eastman Kodak)
13 = Bit Mapped Graphics File [.BMP] (Microsoft)
14 = Digital Audio File [.WAV] (Microsoft & Creative Labs)
15 = Audio plus Moving Video [.AVI] (Microsoft)
16 = PC DOS/Windows Executable Files [.COM][.EXE]
17 = Compressed Binary File [.ZIP] (PKWare Inc)
18 = Audio Interchange File Format AIFF (Apple Computer Inc)
19 = RIFF Wave (Microsoft Corporation)
20 = Freehand (Macromedia/Aldus)
21 = Hypertext Markup Language [.HTML] (The Internet Society)
22 = MPEG 2 Audio Layer 2 (Musicom), ISO/IEC
23 = MPEG 2 Audio Layer 3, ISO/IEC
24 = Portable Document File [.PDF] Adobe
25 = News Industry Text Format (NITF)
26 = Tape Archive [.TAR]
27 = Tidningarnas Telegrambyra NITF version (TTNITF DTD)
28 = Ritzaus Bureau NITF version (RBNITF DTD)
29 = Corel Draw [.CDR]22 FileVersion int16u 30 ServiceIdentifier string[0,10] 40 EnvelopeNumber digits[8] 50 ProductID string[0,32]+ 60 EnvelopePriority digits[1] 70 DateSent digits[8] 80 TimeSent string[11] 90 CodedCharacterSet string[0,32] (values are entered in the form "ESC X Y[, ...]". The escape sequence for UTF-8 character coding is "ESC % G", but this is displayed as "UTF8" for convenience. Either string may be used when writing. The value of this tag affects the decoding of string values in the Application and NewsPhoto records) 100 UniqueObjectName string[14,80] 120 ARMIdentifier int16u 122 ARMVersion int16u
Tag ID Tag Name Writable Values / Notes 0 ApplicationRecordVersion int16u 3 ObjectTypeReference string[3,67] 4 ObjectAttributeReference string[4,68]+ 5 ObjectName string[0,64] 7 EditStatus string[0,64] 8 EditorialUpdate digits[2] 10 Urgency digits[1] 12 SubjectReference string[13,236]+ 15 Category string[0,3] 20 SupplementalCategories string[0,32]+ 22 FixtureIdentifier string[0,32] 25 Keywords string[0,64]+ 26 ContentLocationCode string[3]+ 27 ContentLocationName string[0,64]+ 30 ReleaseDate digits[8] 35 ReleaseTime string[11] 37 ExpirationDate digits[8] 38 ExpirationTime string[11] 40 SpecialInstructions string[0,256] 42 ActionAdvised digits[2] 01 = Object Kill
02 = Object Replace
03 = Ojbect Append
04 = Object Reference45 ReferenceService string[0,10]+ 47 ReferenceDate digits[8]+ 50 ReferenceNumber digits[8]+ 55 DateCreated digits[8] 60 TimeCreated string[11] 62 DigitalCreationDate digits[8] 63 DigitalCreationTime string[11] 65 OriginatingProgram string[0,32] 70 ProgramVersion string[0,10] 75 ObjectCycle string[1] 'a' = Morning
'b' = Both Morning and Evening
'p' = Evening80 By-line string[0,32]+ 85 By-lineTitle string[0,32]+ 90 City string[0,32] 92 Sub-location string[0,32] 95 Province-State string[0,32] 100 Country-PrimaryLocationCode string[3] 101 Country-PrimaryLocationName string[0,64] 103 OriginalTransmissionReference string[0,32] 105 Headline string[0,256] 110 Credit string[0,32] 115 Source string[0,32] 116 CopyrightNotice string[0,128] 118 Contact string[0,128]+ 120 Caption-Abstract string[0,2000] 121 LocalCaption string[0,256] (I haven't found a reference for the format of tags 121, 184-188 and 225-232, so I have just make them writable as strings with reasonable length. Beware that if this is wrong, other utilities won't be able to read these tags as written by ExifTool.) 122 Writer-Editor string[0,32]+ 125 RasterizedCaption string[7360] 130 ImageType string[2] 131 ImageOrientation string[1] 'L' = Landscape
'P' = Portrait
'S' = Square135 LanguageIdentifier string[2,3] 150 AudioType string[2] '0T' = Text Only
'1A' = Mono Actuality
'1C' = Mono Question and Answer Session
'1M' = Mono Music
'1Q' = Mono Response to a Question
'1R' = Mono Raw Sound
'1S' = Mono Scener
'1V' = Mono Voicer
'1W' = Mono Wrap
'2A' = Stereo Actuality
'2C' = Stereo Question and Answer Session
'2M' = Stereo Music
'2Q' = Stereo Response to a Question
'2R' = Stereo Raw Sound
'2S' = Stereo Scener
'2V' = Stereo Voicer
'2W' = Stereo Wrap151 AudioSamplingRate digits[6] 152 AudioSamplingResolution digits[2] 153 AudioDuration digits[6] 154 AudioOutcue string[0,64] 184 JobID string[0,64] 185 MasterDocumentID string[0,256] 186 ShortDocumentID string[0,64] 187 UniqueDocumentID string[0,128] 188 OwnerID string[0,128] 200 ObjectPreviewFileFormat int16u 0 = No ObjectData
1 = IPTC-NAA Digital Newsphoto Parameter Record
2 = IPTC7901 Recommended Message Format
3 = Tagged Image File Format (Adobe/Aldus Image data)
4 = Illustrator (Adobe Graphics data)
5 = AppleSingle (Apple Computer Inc)
6 = NAA 89-3 (ANPA 1312)
7 = MacBinary II
8 = IPTC Unstructured Character Oriented File Format (UCOFF)
9 = United Press International ANPA 1312 variant
10 = United Press International Down-Load Message
11 = JPEG File Interchange (JFIF)
12 = Photo-CD Image-Pac (Eastman Kodak)
13 = Bit Mapped Graphics File [.BMP] (Microsoft)
14 = Digital Audio File [.WAV] (Microsoft & Creative Labs)
15 = Audio plus Moving Video [.AVI] (Microsoft)
16 = PC DOS/Windows Executable Files [.COM][.EXE]
17 = Compressed Binary File [.ZIP] (PKWare Inc)
18 = Audio Interchange File Format AIFF (Apple Computer Inc)
19 = RIFF Wave (Microsoft Corporation)
20 = Freehand (Macromedia/Aldus)
21 = Hypertext Markup Language [.HTML] (The Internet Society)
22 = MPEG 2 Audio Layer 2 (Musicom), ISO/IEC
23 = MPEG 2 Audio Layer 3, ISO/IEC
24 = Portable Document File [.PDF] Adobe
25 = News Industry Text Format (NITF)
26 = Tape Archive [.TAR]
27 = Tidningarnas Telegrambyra NITF version (TTNITF DTD)
28 = Ritzaus Bureau NITF version (RBNITF DTD)
29 = Corel Draw [.CDR]201 ObjectPreviewFileVersion int16u 202 ObjectPreviewData string[0,256000] 221 Prefs string[0,64] (PhotoMechanic preferences) 225 ClassifyState string[0,64] 228 SimilarityIndex string[0,32] 230 DocumentNotes string[0,1024] 231 DocumentHistory string[0,256] 232 ExifCameraInfo string[0,4096]
Tag ID Tag Name Writable Values / Notes 0 NewsPhotoVersion int16u 10 IPTCPictureNumber string[16] (4 numbers: 1-Manufacturer ID, 2-Equipment ID, 3-Date, 4-Sequence) 20 IPTCImageWidth int16u 30 IPTCImageHeight int16u 40 IPTCPixelWidth int16u 50 IPTCPixelHeight int16u 55 SupplementalType int8u 0 = Main Image
1 = Reduced Resolution Image
2 = Logo
3 = Rasterized Caption60 ColorRepresentation int16u 0x0 = No Image, Single Frame
0x100 = Monochrome, Single Frame
0x300 = 3 Components, Single Frame
0x301 = 3 Components, Frame Sequential in Multiple Objects
0x302 = 3 Components, Frame Sequential in One Object
0x303 = 3 Components, Line Sequential
0x304 = 3 Components, Pixel Sequential
0x305 = 3 Components, Special Interleaving
0x400 = 4 Components, Single Frame
0x401 = 4 Components, Frame Sequential in Multiple Objects
0x402 = 4 Components, Frame Sequential in One Object
0x403 = 4 Components, Line Sequential
0x404 = 4 Components, Pixel Sequential
0x405 = 4 Components, Special Interleaving64 InterchangeColorSpace int8u 1 = X,Y,Z CIE
2 = RGB SMPTE
3 = Y,U,V (K) (D65)
4 = RGB Device Dependent
5 = CMY (K) Device Dependent
6 = Lab (K) CIE
7 = YCbCr
8 = sRGB65 ColorSequence int8u 66 ICC_Profile N 70 ColorCalibrationMatrix N 80 LookupTable N 84 NumIndexEntries int16u 85 ColorPalette N 86 IPTCBitsPerSample int8u 90 SampleStructure int8u 0 = OrthogonalConstangSampling
1 = Orthogonal4-2-2Sampling
2 = CompressionDependent100 ScanningDirection int8u 0 = L-R, Top-Bottom
1 = R-L, Top-Bottom
2 = L-R, Bottom-Top
3 = R-L, Bottom-Top
4 = Top-Bottom, L-R
5 = Bottom-Top, L-R
6 = Top-Bottom, R-L
7 = Bottom-Top, R-L102 IPTCImageRotation int8u 0 = 0
1 = 90
2 = 180
3 = 270110 DataCompressionMethod int32u 120 QuantizationMethod int8u 0 = Linear Reflectance/Transmittance
1 = Linear Density
2 = IPTC Ref B
3 = Linear Dot Percent
4 = AP Domestic Analogue
5 = Compression Method Specific
6 = Color Space Specific
7 = Gamma Compensated125 EndPoints N 130 ExcursionTolerance int8u 0 = Not Allowed
1 = Allowed135 BitsPerComponent int8u 140 MaximumDensityRange int16u 145 GammaCompensatedValue int16u
Tag ID Tag Name Writable Values / Notes 10 SizeMode N 0 = Size Not Known
1 = Size Known20 MaxSubfileSize N 90 ObjectSizeAnnounced N 95 MaximumObjectSize N
Tag ID Tag Name Writable Values / Notes 10 SubFile N+
Tag ID Tag Name Writable Values / Notes 10 ConfirmedObjectSize N