Hendrik,
What you are seeing is what I described here:
http://luminous-landscape.com/forum/index....840entry67840Quote from above thread:
"This is because of the way how graphing is implemented in ColorThink 2.1.2. ColorThink Pro 3 works a bit different.
This post on the ColorThink forum explains what is happening:
http://www.colorforums.com/viewtopic.php?t=286Poster 'Kratzy974' writes in above thread:
"The White of the D65 Spaces are rotated to be viewed in a D50 . So the 100,0,0 value is moved to 100, x, y, where x and y are the difference values between the Colortemperature. Just open a sRGB, and you see what I mean. That is fully correct, and I don't want to argue against that. But :
The problem with the rel Colormetric calculation is, that if I view an Image (from sRGB) with Whitepoint away from 100,0,0. Then I use rel Colormetric to a D50 space : the grey line isn't rotated, so the bright values are mapped to the gamut of the D50 colorspace. This looks wrong (also with perceptual...). "
End of quote
Gamut comparisons should be done with the white points adapted in some manner. This will give a better indication of how two gamuts compare than when one of them has a shifted white point.
With adjusted white points the sRGB pRGB comparison looks like this (1st graph, 2nd one is with white points not adjusted):
You'll need ColorThink Pro 3.0 to do this.
Herman