I first noticed the problem on the printout off my Large Format Inkjet
printer using a software RIP - verry sparcely spaced cyan dots on the
paper where it should be just white, I had written a program that can
use LCMS or Microsoft ICM to transform colours and I got the same
reuslts, Cyan and Yellow with an output of 1 (0-255) instead of white.
The Profile is created with Monaco Profiler.
The problem appears when I create a transform using the perceptual
rendering intenent. The input profiles are both Adobe ones so Im
assuming its not them.
RGB 255,255,255 > Perceptual > DeviceCMYK 1,0,1,0 (0-255)
CMYK 0,0,0,0 > Perceptual > DeviceCMYK 1,0,1,0 (0-255)
I could just adjust the linearization curves on the RIP by 1 to
eliminate it on output but Id rather find the source of the problem.
Glenn
Kai-Uwe Behrmann wrote:
Am 03.06.08, 20:46 +1200 schrieb Glenn Wilton:
I have an issue with a profile I have made creating dirty whites with
the Perceptual Intent. This can be seen on the output as very sparcely
spaced Cyan/Yellow dots.
When converting from RGB White (Adobe 1998) or CMYK (US Sheetfed Provile
V2) I end up with a dirty white (0-255 range)
C 1
M 0
Y 1
K 0
How do I determine if this problem is with the LUT, White Point or
Input/Output Curves of the profile?
Can you tell more about exact instructions on how to get your results,
with which software and profiles.
kind regards
Kai-Uwe Behrmann
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