ISO 12640-3:2022
Graphic technology — Prepress digital data exchange — Part 3: CIELAB standard colour image data (CIELAB/SCID)
This document specifies a set of standard large gamut colour images (encoded as 16-bit CIELAB digital data) that can be used for the evaluation of changes in image quality during coding, image processing (including transformation, compression and decompression), displaying on a colour monitor and printing. These images can be used for research, testing and assessing of output systems such as printers, colour management systems and colour profiles.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Requirements
5 Data description and definition
5.1 Data set definition
5.2 Colour encoding used in this document
5.2.1 Image data encoding
5.2.2 Image data arrangement
5.2.3 CIELAB image data (16 bits per channel)
5.2.4 CIELAB image data (8 bits per channel)
5.3 Natural images
5.4 Synthetic images
5.4.1 Colour charts
5.4.2 Vignettes
5.4.3 Synthetic image format
6 Electronic data
6.1 Image file characteristics
6.2 Image file formats
Annex A (normative) Guidance for use of digital data
Annex B (informative) Definition of the reference colour gamut
Annex C (normative) Checksum data
Annex D (informative) Typical TIFF file headers used for image data
Annex E (informative) Text insertion
Annex F (informative) Histogram and gamut plots
Annex G (informative) CIELAB values in colour charts
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Requirements
5 Data description and definition
5.1 Data set definition
5.2 Colour encoding used in this document
5.2.1 Image data encoding
5.2.2 Image data arrangement
5.2.3 CIELAB image data (16 bits per channel)
5.2.4 CIELAB image data (8 bits per channel)
5.3 Natural images
5.4 Synthetic images
5.4.1 Colour charts
5.4.2 Vignettes
5.4.3 Synthetic image format
6 Electronic data
6.1 Image file characteristics
6.2 Image file formats
Annex A (normative) Guidance for use of digital data
Annex B (informative) Definition of the reference colour gamut
Annex C (normative) Checksum data
Annex D (informative) Typical TIFF file headers used for image data
Annex E (informative) Text insertion
Annex F (informative) Histogram and gamut plots
Annex G (informative) CIELAB values in colour charts
Bibliography