Adobe-RGB Different primary colors
Adobe-RGB Different primary colors
- Subject: Adobe-RGB Different primary colors
- From: "J. Raimar Kuhnen" <email@hidden>
- Date: Thu, 23 Aug 2007 22:02:11 +0200
- Thread-topic: Adobe-RGB Different primary colors
Hallo Color users,
After checking some primary color definitions inside diffeent working spaces
i´ve noticed that the primary colors in the original Adobe-RGB 1998 profile
differs from the Adobe Documentation for Adobe-RGB 1998.
According to the documenation,the primaries are at:
Red x=0.6400, y=0.3300
Green x=0.2100, y=0.7100
Blue x=0.1500, y=0.0600
White x=0.3127, y=0.3290 (the reference white is D65)
but if you inspect the primary colors in the Adobe-RGB 1998 profile (with
the Colorsync utility or Chromix) one can see a discrepancy especially in
the greens:
Red x=0.6484, y=0.3309
Green x=0.2302, y=0.7015
Blue x=0.1559, y=0.0660
The other deviations in the third column after the comma can be more or less
ignored, but a difference of x=0.02 and y=0.01 for green cannot be ignored.
I´ve tried to find the reason for that and have calculated the D65 primary
colors down to D50 by using a chromatic adaption (bradford is Adobe´s
preferred one) but there is no change to the values that the documentation
lists for green. Mostly the blues are influenced by chromatic adaptions.
Does anyone knows why there are different primaries?
Best regards
Raimar
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