The differences that I experienced seem to come from the adaptation from
the ICC D50 illuminant to the sRGB D65 'illuminant'.
Since I am interested in finding the true primaries of display phosphors
in the ICC profile, it seems that these values could be found if it
possible to replace the white point in a profile to D50 and then use the
function cmsTakeColorants. I have tried to add a whitepoint tag, but that
does not seem to work (it probably adds a second white point at the end
and does not replace the white point). Does anyway have an idea of how it
is possible to get the true RGB chromaticity coordinates of an ICC file
(or how to replace a whitepoint tag) in lcms?
Regards,
Gerard
Dear All,
I am puzzled about the chromaticity coordinates of the colorants in
different profiles. For example, on numerous websites the chromaticity
coordinates of the sRGB profile is described as:
x y
Red 0.64 0.33
Green 0.30 0.60
Blue 0.15 0.06
However, if I use the cmsTakeColorants function (but the same result is
obtained with the ICC profile inspector), I get
x y
Red 0.6485 0.3309
Green 0.3212 0.5978
Blue 0.1559 0.0660
Also when I look at other standard profiles I get decrepancies, especially
in the x-coordinate of Green. Does anyone know why this is? Does it have
to do with the white point or the iluminant data???
Kind regards,
Gerard
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