Marttila Jouni wrote:
Hello
Interesting colour at the tip of the AdobeRGB gamut. I checked the Delta L*,
Delta C* and Delta h* from original Adobe RGB Lab-values to ISOcoated
Lab-values
- with perceptual: DL* 0.1, DC* 84.1, Dh* 24.3
- with relative: DL* 2.8, DC* 82.0, Dh* 1.3
So actually from colour numbers relative is reproducing the hue much better
than perceptual. Same thing can be seen if you draw ab-space at L-level of
30 and put those Lab-values there and draw a line from 0,0 to 68, -112.
ISOcoated's relative colour is almost on the line.
However how we experience the colours is another story...
Yes it is. CIELAB has serious problems exactly in this region, as
published by F. Ebner and M.D. Fairchild in "Finding Constant Hue
Surfaces in Color Space", SPIE/IS&T Electronic Imaging, (1998)
two Links:
http://www.cis.rit.edu/people/faculty/fairchild/CAM.html
and - on the same Page page
http://www.cis.rit.edu/people/faculty/fairchild/files/Ebner_Constant_Hue_Da…
Klaus