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martinnoweck
06-08-2007, 08:45 AM
Hi everyone,

I have been reading the DCI-Specs and they are talking about XYZ-Colorspace.

I have tried to do some research but here is my question: can I compare XYZ space to RGB space or am I doing something wrong?

Kind regards,
Martin
Adrian T.
06-08-2007, 09:37 AM
Extract from the DCI Specs:
The DCDM shall use the 1931 CIE system of colorimetry [CIE Publication 15:2004, Colorimetry, 3rd Edition] (x, y coordinates) to describe the color primaries X, Y, and Z as a gamut container.

More information about the CIE XYZ Tristimulus color space can be found here:
http://en.wikipedia.org/wiki/Color_models
:nerd:
GlennChan
06-08-2007, 03:13 PM
DCI's XYZ color space:

Uses X Y Z primaries.

Gamma is 2.6. CIE XYZ doesn't have gamma (or it has a gamma of 1). sRGB and Rec. 709 have their own transfer functions.

The white point is different x=0.3140 y=0.3150
D65 (used in sRGB, Rec. 709) is x=0.3127 y=0.3290