International Press and Telecommunications Council Standards (IPTC) have been created for exchanging different type of information.
IPTC is a metadata format rather than a image file format. It can be stored within JPEG and TIFF image files as Adobe Photoshop Image Resource (see Photoshop Image Resource Metadata Structure). In TIFF files the IPTC data is stored in TIFF tag with Id = 34377 (see TIFF Non-Image Data Structure for metadata structure of the tag). In JPEG files, the IPTC data is stored in Photoshop Image Resource APP13 marker segment (see JPEG Non-Image Data Structure).
ImageGear IPTC metadata structure is framed in two levels:
- IPTC level containing all IPTC data
- Record level containing value items of a record
IPTC Level
| Name |
Id |
Type |
Value Type |
Value |
Value Length |
Ignored on save |
| Record level 1 |
<Record#> |
Tree |
|
|
|
|
| |
| Record level n |
<Record#> |
Tree |
|
|
|
|
The <Record#> tag is the primary identifier of IPTC record. Its value is the number of appropriate IPTC record described in IPTC - NAA IIM4 specification. Record levels must follow in numerical order within IPTC level.
Record Level
| Name |
Id |
Type |
Value Type |
Value |
Value Length |
Ignored on save |
| Dataset value item |
<DataSet ID> |
Leaf |
<Value Type> |
<Data> |
<Item Count> |
FALSE |
| |
| Dataset value item |
<DataSet ID> |
Leaf |
<Value Type> |
<Data> |
<Item Count> |
FALSE |
The available <Dataset name>, <Dataset Id>, <Item Count>, and <Value Type> values are described below for each IPTC record according to IPTC-NAA IIM4 specification. Dataset value item can follow in any order within appropriate record level.
In the tables below, the last column lists the maximum item count for non-string types, and string length for string types. Item count for string types in IPTC metadata is always 1.
Dataset Value Items Description for IPTC Envelope Record (Record #1)
| Item Identifier |
Item Name |
Value Type |
Max. Value Length
(for String last NULL is not counted) |
| 0 |
"ModelVersion" |
UINT16 |
1 |
| 5 |
"Destination" |
STRING |
1024 |
| 20 |
"FileFormat" |
UINT16 |
1 |
| 22 |
"FileFormatVersion" |
UINT16 |
1 |
| 30 |
"ServiceIdentifier" |
STRING |
10 |
| 40 |
"EnvelopeNumber" |
STRING |
8 |
| 50 |
"ProductID" |
STRING |
32 |
| 60 |
"EnvelopePriority" |
STRING |
1 |
| 70 |
"DateSent" |
STRING |
8 |
| 80 |
"TimeSent" |
STRING |
11 |
| 90 |
"CodedCharacterSet" |
STRING |
32 |
| 100 |
"UNO" |
STRING |
80 |
| 120 |
"ARMIdentifier" |
UINT16 |
1 |
| 122 |
"ARMVersion" |
UINT16 |
1 |
Dataset Value Items Description for IPTC Application Record (Record #2)
| Item Identifier |
Item Name |
Value Type |
Max. Value Length
(for String last NULL is not counted) |
| 0 |
"RecordVersion" |
UINT16 |
1 |
| 3 |
"ObjectTypeReference" |
STRING |
67 |
| 4 |
"ObjectAttributeReference" |
STRING |
68 |
| 5 |
"ObjectName" |
STRING |
64 |
| 7 |
"EditStatus" |
STRING |
64 |
| 8 |
"EditorialUpdate" |
STRING |
2 |
| 10 |
"Urgency" |
STRING |
1 |
| 12 |
"SubjectReference" |
STRING |
236 |
| 15 |
"Category" |
STRING |
3 |
| 20 |
"SupplementalCategory" |
STRING |
32 |
| 22 |
"FixtureIdentifier" |
STRING |
32 |
| 25 |
"Keywords" |
STRING |
64 |
| 26 |
"ContentLocationCode" |
STRING |
3 |
| 27 |
"ContentLocationName" |
STRING |
64 |
| 30 |
"ReleaseDate" |
STRING |
8 |
| 35 |
"ReleaseTime" |
STRING |
11 |
| 37 |
"ExpirationDate" |
STRING |
8 |
| 38 |
"ExpirationTime" |
STRING |
11 |
| 40 |
"SpecialInstructions" |
STRING |
256 |
| 42 |
"ActionAdvised" |
STRING |
2 |
| 45 |
"ReferenceService" |
STRING |
10 |
| 47 |
"ReferenceDate" |
STRING |
8 |
| 50 |
"ReferenceNumber" |
STRING |
8 |
| 55 |
"DateCreated" |
STRING |
8 |
| 60 |
"TimeCreated" |
STRING |
11 |
| 62 |
"DigitalCreationDate" |
STRING |
8 |
| 63 |
"DigitalCreationTime" |
STRING |
11 |
| 65 |
"OriginatingProgram" |
STRING |
32 |
| 70 |
"ProgramVersion" |
STRING |
10 |
| 75 |
"ObjectCycle" |
STRING |
1 |
| 80 |
"By-line" |
STRING |
32 |
| 85 |
"By-lineTitle" |
STRING |
32 |
| 90 |
"City" |
STRING |
32 |
| 92 |
"Sublocation" |
STRING |
32 |
| 95 |
"Province/State" |
STRING |
32 |
| 100 |
"Country/
PrimaryLocationCode" |
STRING |
3 |
| 101 |
"Country/
PrimaryLocationName" |
STRING |
64 |
| 103 |
"OriginalTransmission
Reference" |
STRING |
32 |
| 105 |
"Headline" |
STRING |
256 |
| 110 |
"Credit" |
STRING |
32 |
| 115 |
"Source" |
STRING |
32 |
| 116 |
"CopyrightNotice" |
STRING |
128 |
| 118 |
"Contact" |
STRING |
128 |
| 120 |
"Caption/Abstract" |
STRING |
2000 |
| 122 |
"Writer/Editor" |
STRING |
32 |
| 125 |
"RasterizedCaption" |
UINT8 |
7360 |
| 130 |
"ImageType" |
STRING |
2 |
| 131 |
"ImageOrientation" |
STRING |
1 |
| 135 |
"LanguageIdentifier" |
STRING |
3 |
| 150 |
"AudioType" |
STRING |
2 |
| 151 |
"AudioSamplingRate" |
STRING |
6 |
| 152 |
"AudioSamplingResolution" |
STRING |
2 |
| 153 |
"AudioDuration" |
STRING |
6 |
| 154 |
"AudioOutcue" |
STRING |
64 |
| 200 |
"ObjectDataPreview
FileFormat" |
UINT16 |
1 |
| 201 |
"ObjectDataPreview
FileFormatVersion" |
UINT16 |
1 |
| 202 |
"ObjectDataPreviewData" |
UINT8 |
Undefined |
Dataset Value Items Description for IPTC Digital News Photo Parameter Record (Record #3)
| Item Identifier |
Item Name |
Value Type |
Max. Value Length (for String last NULL is not counted) |
| 0 |
"RecordVersion" |
UINT16 |
1 |
| 10 |
"PictureNumber" |
RAW_DATA |
16 |
| 20 |
"PixelsPerLine" |
UINT16 |
1 |
| 30 |
"NumberOfLine" |
UINT16 |
1 |
| 40 |
"PixelSizeInScanningDirection" |
UINT16 |
1 |
| 50 |
"PixelSizePerpendicularTo
ScanningDirection" |
UINT16 |
1 |
| 55 |
"SupplementType" |
UINT8 |
1 |
| 60 |
"ColourRepresentation" |
UINT8 |
2 |
| 64 |
"InterchangeColourSpace" |
UINT8 |
1 |
| 65 |
"ColourSequence" |
UINT8 |
4 |
| 66 |
"ICCInputColourProfile" |
RAW_DATA |
Undefined |
| 70 |
"ColourCalibrationMatrixTable" |
RAW_DATA |
Undefined |
| 80 |
"LookupTable" |
RAW_DATA |
131072 |
| 84 |
"NumberOfIndexEntries" |
UINT16 |
1 |
| 85 |
"ColourPalette" |
RAW_DATA |
Undefined |
| 86 |
"NumberOfBitsPerSample" |
UINT8 |
1 |
| 90 |
"SamplingStructure" |
UINT8 |
1 |
| 100 |
"ScanningDirection" |
UINT8 |
1 |
| 102 |
"ImageRotation" |
UINT8 |
1 |
| 110 |
"DataCompressionMethod" |
RAW_DATA |
4 |
| 120 |
"QuantisationMethod" |
UINT8 |
1 |
| 125 |
"EndPoints" |
UINT8 |
Undefined |
| 130 |
"ExcursionTolerance" |
UINT8 |
1 |
| 135 |
"BitsPerComponent" |
UINT8 |
Undefined |
| 140 |
"MaximumDensityRange" |
UINT16 |
1 |
| 145 |
"GammaCompensatedValue" |
UINT16 |
1 |
Dataset Value Items Description for IPTC Pre-Object Descriptor Record (Record #7)
| Item Identifier |
Item Name |
Value Type |
Max. Value Length (for String last NULL is not counted) |
| 10 |
"SizeMode" |
UINT8 |
1 |
| 20 |
"MaxSubfileSize" |
UINT8 or
UINT16 or
UINT32 |
1 |
| 90 |
"ObjectDataSizeAnnounced" |
UINT8 or
UINT16 or
UINT32 |
1 |
| 95 |
"MaximumObjectDataSize" |
UINT8 or
UINT16 or
UINT32 |
1 |
Dataset Value Items Description for IPTC Object Record (Record #8)
| Item Identifier |
Item Name |
Value Type |
Max. Value Length (for String last NULL is not counted) |
| 10 |
"Subfile" |
RAW_DATA |
Undefined |
Dataset Value Items Description for IPTC Post-Object Descriptor Record (Record #9)
| Item Identifier |
Item Name |
Value Type |
Max. Value Length (for String last NULL is not counted) |
| 10 |
"ConfirmedObjectDataSize" |
UINT8 or
UINT16 or
UINT32 |
1 |
