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I removed a line stating rec2020 coverage of CIE 1932 color space as well as adobe and rec709. These figures referred to a SID paper, which in turn refrenced Cambridge University Press, Cambridge, 1932. So if the figures are to be used they should cite the original article. I could not access a copy of the original article and based on my calculations the numbers given were incorrect. — Preceding
unsigned comment added by
146.115.5.122 (
talk)
14:01, 11 December 2015 (UTC)reply
The color space is the primary colors and the white point. There are several transfer functions that can be used with the Rec. 2020 color space. --
GrandDrake (
talk)
03:59, 5 April 2016 (UTC)reply
The color space could be defined by the chromaticity coordinates of the primaries, the white point, and the electro-optical conversion function, but that does not in any way elevate the 1931 XYZ chromaticity diagram (which is 2 dimensional) to a color space (which has three dimensions). The diagram at the top of the page as of this date is not of a color space, it is a chromaticity diagram. A dimension is missing for it the diagram to be of a color space; it is merely a chromaticity diagram.
Lovibond (
talk)
23:07, 5 April 2016 (UTC)reply
Color space has been defined by the primary colors and white point while the transfer function can vary and
scRGB even has a dynamic range that changes depending on the bit depth. The Rec. 2020 color space can be used with the Rec. 2020 transfer function,
SMPTE ST 2084, and
Hybrid Log-Gamma. Also color spaces such as
CIE 1931 color space,
CIE 1964 color space, and
Lab color space don't define a transfer function. Also there are color spaces that define a transfer function but don't define a brightness. --
GrandDrake (
talk)
00:02, 6 April 2016 (UTC)reply
None of your statement addresses the fact that the CIE 1931 chromaticity space is not a color space. The figure near the top of the article is in chromaticity space, not color space.
The CIE 1931 color space does indeed include what you refer to as a transfer function, though implicitly. It is radiometrically linear. The CIE 1964 U* V* W* color space likewise has a transfer function, based on Reilly's cube root approximation. The CIE 1976 color spaces CIELAB and CIELUV both have as their transfer function a slight modification of the cube root formula used in the 1964 U* V* W* color space. Nevertheless, none of this bears on the fact that the figure is in chromaticity space, not color space. Accordingly, your most recent edit restored a factual inaccuracy that had been corrected, and it therefore should be reverted.
Lovibond (
talk)
14:04, 6 April 2016 (UTC)reply
Irrelevant. As I pointed out earlier, this does not make the (x, y) chromaticity diagram into a color space. Do you actually believe the (x, y) chromaticity diagram is a color space?
Lovibond (
talk)
02:52, 9 April 2016 (UTC)reply
A color space is a combination of color primaries and white point which is shown as a 2D image. Also even with a defined brightness range the encoding method (RGB, YCbCr, etc...) changes the maximum brightness of the primary colors. Dolby uses the term color volume to refer to a combination of color space, transfer function, and encoding method which can be used to make a 3D image of colors at all ranges of supported brightness. --
GrandDrake (
talk)
03:45, 12 April 2016 (UTC)reply
Y' as Weighted Sum
Under "RGB and luma-chroma formats", Y' is described as a weighted average. I believe it should be described as a weighted sum. See the equation given. — Preceding
unsigned comment added by
172.91.176.10 (
talk)
11:41, 9 March 2020 (UTC)reply