(Preliminary)
The Concept of PcS
A perfect RGB color space is one that possesses both of the following basic characteristics, under D50 illuminant and 2° observer conditions and when color space conversion is carried out with relative colorimetric rendering intent.
1. RGB Scalability
The 3 primary colors (R, G and B) would remain homogenous (*) when color space conversion is carried out within the Perfect Color Space family.
2. Neutrality Consideration
R=G=B, or equal amount of R,G and B will yield perfect neutral gray. It is proposed that the RGB values for any 2 of the primaries along the neutral axis must be identical and that the third primary should not be deviated from this value by more than 1 count after conversion. This specification was made after careful studying of the currently available color spaces. Refer to below note for examples.
In view of the above requirement, not all the currently known color spaces are Perfect Color Space compliant.
The following list is by no means exhaustive.
The color spaces in RED are Perfect Color Space compliant.
Note: Examples of acceptable neutral gray after conversion
a) Perfect neutral, RGB=(135 135 135)
b) Acceptable neutral gray after conversion, RGB= (135 136 135)
c) Unacceptable neutral gray after conversion, RGB= (134 135 136) or (135 135 137)
Test Condition
Color conversion with Relative Colorimetric rendering intent is specified and that is due to White reference for the profiles may not be exactly Lab=(100.000, 0.000, 0.000).
.../ to be continued
The Concept of PcS
A perfect RGB color space is one that possesses both of the following basic characteristics, under D50 illuminant and 2° observer conditions and when color space conversion is carried out with relative colorimetric rendering intent.
1. RGB Scalability
The 3 primary colors (R, G and B) would remain homogenous (*) when color space conversion is carried out within the Perfect Color Space family.
2. Neutrality Consideration
R=G=B, or equal amount of R,G and B will yield perfect neutral gray. It is proposed that the RGB values for any 2 of the primaries along the neutral axis must be identical and that the third primary should not be deviated from this value by more than 1 count after conversion. This specification was made after careful studying of the currently available color spaces. Refer to below note for examples.
In view of the above requirement, not all the currently known color spaces are Perfect Color Space compliant.
The following list is by no means exhaustive.
The color spaces in RED are Perfect Color Space compliant.
Perfect Color Space/
Color Space Gamut Volume No. of Imaginary Primary
1. ExtremeRGB 2,826,506 No / 3
2. DCam5 2,755,025 No / 3
3. MaxRGB 2,529,960 No / 3
4. DCam4 2,439,139 No / 2
5. ProPhoto RGB 2,429,670 Yes/ 2
MelissaRGB 2,428,701 Yes/ 2
6. WideGamut RGB 1,994,225 No / 0
7. jcSPACE RGB 1,971,923 Yes/ 0 (preliminary)
8. BestRGB 1,960,820 No / 0
9. DCam3 1,838,572 Yes/ 1
10. DonRGB4 1,738,253 No / 0
11. CEIRGB 1,712,629 No / 0
12. BetaRGB 1,655,272 No / 0
12. BetaRGB 1,655,272 No / 0
13. EktaSpace PS5 1,555,220 No / 1
14. Dcam2 1,431,681 No / 1
15. NTSC (1953) 1,383,526 No / 0
16. eciRGB_v2 1,285,904 No / 0
16. eciRGB_v2 1,285,904 No / 0
17. NTSC (1953) 1,257,099 No / 0
18. AdobeRGB(1998) 1,165,420 Yes/ 0
19. BruceRGB 950,900 Yes/ 0
20. Generic RGB 849,794 No / 0
21. PAL/SECAM 813,794 No / 0
21. PAL/SECAM 813,794 No / 0
22. sRGB 798,455 Yes/ 0
23. ColorMatch RGB 790,723 Yes/ 0
24. AppleRGB 763,273 Yes/ 0
25. SMPTE-C 725,385 No / 0
26. DCam1 712,145 No / 0
Note: Examples of acceptable neutral gray after conversion
a) Perfect neutral, RGB=(135 135 135)
b) Acceptable neutral gray after conversion, RGB= (135 136 135)
c) Unacceptable neutral gray after conversion, RGB= (134 135 136) or (135 135 137)
Test Condition
Color conversion with Relative Colorimetric rendering intent is specified and that is due to White reference for the profiles may not be exactly Lab=(100.000, 0.000, 0.000).
.../ to be continued
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