ISO 15076-1:2025

International
Standard
ISO 15076-1
Third edition
Image technology colour
2025-10
management — Architecture,
profile format and data structure —
Part 1:
Based on ICC.1:2022
Gestion de couleur en technologie d'image — Architecture,
format de profil et structure de données —
Partie 1: Sur la base de l'ICC.1:2022
Reference number
© ISO 2025
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Published in Switzerland
ii
Contents Page
Foreword .vii
Introduction .viii
1 Scope . 1
2 Normative references . 1
3 Terms, definitions and abbreviated terms . 2
3.1 Terms and definitions .2
3.2 Abbreviated terms .6
4 Basic number types . 6
4.1 General .6
4.2 dateTimeNumber .6
4.3 float32Number .7
4.4 positionNumber .7
4.5 response16Number .7
4.6 s15Fixed16Number .8
4.7 u16Fixed16Number .8
4.8 u1Fixed15Number .8
4.9 u8Fixed8Number .8
4.10 uInt16Number .8
4.11 uInt32Number . .8
4.12 uInt64Number .9
4.13 uInt8Number .9
4.14 XYZNumber .9
4.15 Seven-bit ASCII .9
5 Conformance . 9
6 Profile connection space, rendering intents and device encoding . 9
6.1 General considerations.9
6.2 Rendering intents .10
6.2.1 General .10
6.2.2 Media-relative colorimetric intents .10
6.2.3 ICC-absolute colorimetric intent .10
6.2.4 Perceptual intent .11
6.2.5 Saturation intent .11
6.3 Profile connection space .11
6.3.1 Chromatic adaptation .11
6.3.2 Colorimetric specification .11
6.3.3 Reference viewing environment and medium for the perceptual rendering intent . 13
6.3.4 Colour space encodings for the PCS . 15
6.4 Converting between PCSXYZ and PCSLAB encodings .17
6.5 Device encoding .18
7 Profile requirements . .18
7.1 General .18
7.2 Profile header . 20
7.2.1 General requirements . 20
7.2.2 Profile size field (bytes 0 to 3) . 20
7.2.3 Preferred CMM type field (bytes 4 to 7) . 20
7.2.4 Profile version field (bytes 8 to 11) .21
7.2.5 Profile/device class field (bytes 12 to15) .21
7.2.6 Data colour space field (bytes 16 to 20) .21
7.2.7 PCS field (bytes 20 to 23) . 22
7.2.8 Date and time field (bytes 24 to 35) . 22
7.2.9 Profile file signature field (bytes 36 to 39) . 22
7.2.10 Primary platform field (bytes 40 to 43) . 22

iii
7.2.11 Profile flags field (bytes 44 to 47) . 23
7.2.12 Device manufacturer field (bytes 48 to 51) . 23
7.2.13 Device model field (bytes 52 to 55) . 23
7.2.14 Device attributes field (bytes 56 to 63) . 23
7.2.15 Rendering intent field (bytes 64 to 67). 23
7.2.16 PCS illuminant field (Bytes 68 to 79) .24
7.2.17 Profile creator field (bytes 80 to 83) .24
7.2.18 Profile ID field (bytes 84 to 99) .24
7.2.19 Reserved field (bytes 100 to 127) .24
7.3 Tag table .24
7.3.1 Overview .24
7.3.2 Tag count (byte position 0 to 3) . 25
7.3.3 Tag signature (byte position 4 to 7 and repeating) . 25
7.3.4 Offset to beginning of tag data element (byte position 8 to 11 and repeating) . 25
7.3.5 Tag data element size (byte position 12 to 15 and repeating) . 25
7.4 Tag data . 26
8 Required tags .26
8.1 General . 26
8.2 Common requirements . 26
8.3 Input profiles . 26
8.3.1 General . 26
8.3.2 N-component LUT-based Input profiles .27
8.3.3 Three-component matrix-based Input profiles .27
8.3.4 Monochrome Input profiles .27
8.4 Display profiles . 28
8.4.1 General . 28
8.4.2 N-Component LUT-based Display profiles . . 28
8.4.3 Three-component matrix-based Display profiles . 28
8.4.4 Monochrome Display profiles . 28
8.5 Output profiles. 29
8.5.1 General . 29
8.5.2 N-component LUT-based Output profiles . 29
8.5.3 Monochrome Output profiles . 29
8.6 DeviceLink profile . 29
8.7 ColorSpace profile . 30
8.8 Abstract profile . 30
8.9 NamedColor profile .31
8.10 Precedence order of tag usage .31
8.10.1 General .31
8.10.2 Input, display, output or colour space profile types .31
8.10.3 DeviceLink or Abstract profile types .31
9 Tag definitions .32
9.1 General .32
9.2 Tag listing . 33
9.2.1 AToB0Tag. 33
9.2.2 AToB1Tag . 33
9.2.3 AToB2Tag . 33
9.2.4 blueMatrixColumnTag . 33
9.2.5 blueTRCTag . 33
9.2.6 BToA0Tag . 34
9.2.7 BToA1Tag . 34
9.2.8 BToA2Tag . 34
9.2.9 BToD0Tag . 34
9.2.10 BToD1Tag . 34
9.2.11 BToD2Tag . 34
9.2.12 BToD3Tag . 35
9.2.13 calibrationDateTimeTag . 35
9.2.14 charTargetTag . 35

iv
9.2.15 chromaticAdaptationTag . . 35
9.2.16 chromaticityTag . 36
9.2.17 cicpTag . 36
9.2.18 colorantOrderTag . 36
9.2.19 colorantTableTag . 36
9.2.20 colorantTableOutTag .37
9.2.21 colorimetricIntentImageStateTag .37
9.2.22 copyrightTag . 39
9.2.23 deviceMfgDescTag . 39
9.2.24 deviceModelDescTag . 39
9.2.25 DToB0Tag . 39
9.2.26 DToB1Tag. 39
9.2.27 DToB2Tag . 39
9.2.28 DToB3Tag . 40
9.2.29 gamutTag . 40
9.2.30 grayTRCTag . 40
9.2.31 greenMatrixColumnTag . 40
9.2.32 greenTRCTag . 40
9.2.33 luminanceTag . 40
9.2.34 measurementTag . .41
9.2.35 metadataTag .41
9.2.36 mediaWhitePointTag .41
9.2.37 namedColor2Tag .41
9.2.38 outputResponseTag .41
9.2.39 perceptualRenderingIntentGamutTag .42
9.2.40 preview0Tag .42
9.2.41 preview1Tag .42
9.2.42 preview2Tag .42
9.2.43 profileDescriptionTag .43
9.2.44 profileSequenceDescTag .43
9.2.45 profileSequenceIdentifierTag .43
9.2.46 redMatrixColumnTag .43
9.2.47 redTRCTag .43
9.2.48 saturationRenderingIntentGamutTag .43
9.2.49 technologyTag . 44
9.2.50 viewingCondDescTag . . 44
9.2.51 viewingConditionsTag .45
10 Tag type definitions .45
10.1 General .45
10.2 chromaticityType .45
10.3 cicpType . 46
10.4 colorantOrderType .47
10.5 colorantTableType . 48
10.6 curveType . 48
10.7 dataType . 49
10.8 dateTimeType. 49
10.9 dictType . 49
10.10 lut16Type .51
10.11 lut8Type . 55
10.12 lutAToBType.57
10.12.1 General .57
10.12.2 “A” curves . 58
10.12.3 CLUT . 58
10.12.4 “M” curves .59
10.12.5 Matrix .59
10.12.6 “B” curves .59
10.13 lutBToAType . 60
10.13.1 General . 60

v
10.13.2 “B” curves .61
10.13.3 Matrix .61
10.13.4 “M” curves .61
10.13.5 CLUT .61
10.13.6 “A” curves .62
10.14 measurementType.62
10.15 multiLocalizedUnicodeType . 63
10.16 multiProcessElementsType . 64
10.16.1 General . 64
10.16.2 multiProcessElementsType Elements . 65
10.17 namedColor2Type . 69
10.18 parametricCurveType .71
10.19 profileSequenceDescType .71
10.20 profileSequenceIdentifierType . 72
10.20.1 General . 72
10.20.2 Profile ID . . 73
10.20.3 Profile Description . 73
10.21 responseCurveSet16Type . 73
10.22 s15Fixed16ArrayType .76
10.23 signatureType .76
10.24 textType .76
10.25 u16Fixed16ArrayType . .76
10.26 uInt16ArrayType . 77
10.27 uInt32ArrayType . 77
10.28 uInt64ArrayType . 77
10.29 uInt8ArrayType . 78
10.30 viewingConditionsType . 78
10.31 XYZType . 78
Annex A (informative) Data colour encodings and rendering intents .79
Annex B (informative) Embedding profiles .82
Annex C (informative) Relationship between ICC profiles and PostScript CSAs and CRDs .83
Annex D (informative) Profile connection space .85
Annex E (informative) Chromatic adaptation tag .98
Annex F (normative) Profile computational models .101
Annex G (informative) Tables of required tags and tag list .103
Annex H (informative) Relationship to iccMAX .109
Bibliography .110

vi
Foreword
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This document was prepared by Technical Committee ISO/TC 130, Graphic technology.
This third edition cancels and replaces the second edition (ISO 15076-1:2010), which has been technically
revised.
The main changes are as follows:
— cicpTag has been added to enable HDR metadata to be carried in the profile;
— metadataTag and dictType have been added to enable flexible definition of additional metadata;
— it has been clarified that PCSXYZ values can be negative;
— Tag tables are now required to define a contiguous sequence
...