ISO/TS 22028-5:2023
Photography and graphic technology — Extended colour encodings for digital image storage, manipulation and interchange — Part 5: High dynamic range and wide colour gamut encoding for still images (HDR/WCG)
This document defines a set of colour image encodings for use in storage, transmission, and display of high dynamic range and wide colour gamut (HDR/WCG) digital still images. It defines the colour encodings, the mandatory and optional metadata, and the reference viewing conditions for HDR/WCG images.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms, definitions and acronyms
4 Requirements
4.1 General introduction
4.2 Colour image encoding
4.2.1 General
4.2.2 Colour primaries and white point
4.2.3 Baseline colour encoding
4.3 Transfer functions
4.3.1 General
4.3.2 Hybrid Log-Gamma (HLG) system
4.3.3 Perceptual quantizer (PQ) system
4.4 Reference viewing environment
4.5 Reference display
4.5.1 General
4.5.2 Default reference display colour primaries
4.5.3 Default nominal peak luminance
4.5.4 Default black point
4.5.5 Default nominal diffuse white luminance
4.6 Metadata
4.6.1 General
4.6.2 Coding-independent code points for video signal type identification: CICP metadata
4.6.3 Reference environment metadata
4.6.4 Colour volume metadata
4.6.5 Diffuse white luminance metadata
4.6.6 Scene-referred metadata
5 Colour mapping
5.1 General
5.2 Colour conversions
Annex A (normative) Extended HDR/WCG colour encoding
Annex B (informative) ITU-R transfer functions
Annex C (informative) HDR signalling
Annex D (informative) Workflows for the different transfer functions
Annex E (informative) Image states and linear light colorimetric interpretations
Annex F (informative) Display tone mapping
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms, definitions and acronyms
4 Requirements
4.1 General introduction
4.2 Colour image encoding
4.2.1 General
4.2.2 Colour primaries and white point
4.2.3 Baseline colour encoding
4.3 Transfer functions
4.3.1 General
4.3.2 Hybrid Log-Gamma (HLG) system
4.3.3 Perceptual quantizer (PQ) system
4.4 Reference viewing environment
4.5 Reference display
4.5.1 General
4.5.2 Default reference display colour primaries
4.5.3 Default nominal peak luminance
4.5.4 Default black point
4.5.5 Default nominal diffuse white luminance
4.6 Metadata
4.6.1 General
4.6.2 Coding-independent code points for video signal type identification: CICP metadata
4.6.3 Reference environment metadata
4.6.4 Colour volume metadata
4.6.5 Diffuse white luminance metadata
4.6.6 Scene-referred metadata
5 Colour mapping
5.1 General
5.2 Colour conversions
Annex A (normative) Extended HDR/WCG colour encoding
Annex B (informative) ITU-R transfer functions
Annex C (informative) HDR signalling
Annex D (informative) Workflows for the different transfer functions
Annex E (informative) Image states and linear light colorimetric interpretations
Annex F (informative) Display tone mapping
Bibliography