On Nov 7, 2005, at 6:58 AM, Joerg Schober wrote:
Klaus Karcher wrote:
Not only eci profiles produce anormalies, not only in saturated
blues and not only in one intent ;-)
... but an image says more than thousand words: take a look at
this one (it's a Lab TIF, so you have to download it and view it
with Photoshop):
http://digitalproof.info/perceptual-rendering/
gelb-vgl.tif
Thats not surprising. The LAB-Values of the original are 99/-10/47,
for example. This color is far far out of gamut of CMYK and out of
gamut of (ECI-)RGB.
IMHO that is not a real but a virtual color.
Are the output profiles ICC v2 or v4? I have seen minimal difference
with v4 output profiles in conjunction with v2 source profiles, with
respect to these kinds of problems (blues going to purple). However I
have just seen at ICC DevCon some initial results using preliminary
v4 sRGB where this problem isn't present with the same output profile
(the output profile was v4 in all cases).
Chris Murphy
Color Remedies (TM)
www.colorremedies.com/realworldcolor
-------------------------------------------------------------
Co-author "Real World Color Management, 2nd Edition"
Published by PeachPit Press (ISBN 0-321-26722-2)