GB/T 7921-2008Uniform color space and color difference formula (English PDF)

1 Scope

This standard specifies the visually approximately uniform CIE1976 (L Rao   Chou) color space and CIE1976 (L u   vp) color space

And the appropriate color formulas and calculation methods CIEDE2000 color formula.

Representation and calculation object This standard applies to color and light color representation and chromatic aberration.

2 Normative references

The following documents contain provisions which, through reference in this standard and become the standard terms. For dated references, subsequent

Amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to the agreement according to study

Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this standard.

GB/T 5698 color terms

101 CIE publication. Impact Assessment of 1993 color parameters

142 CIE publication.2001 industrial color difference evaluation Improvement

3 Terms and Definitions

GB/T 5698 and identified the following terms and definitions apply to this standard.

4 CIE1976 uniform chromaticity scale diagram (UCS diagram)

CIE1976 uniform chromaticity scale diagram by the CIE1931 chromaticity diagram for the projection transformation obtained in the visual than the x, y color space chromaticity diagram

Between more uniform, see Figure 1.