Re: Of black point compensation (short version -:))
Re: Of black point compensation (short version -:))
- Subject: Re: Of black point compensation (short version -:))
- From: Henrik Holmegaard <email@hidden>
- Date: Tue, 3 Jul 2001 08:13:33 +0200
lasse seppala <email@hidden> wrote:
For softproofing
you should use the rendering intent (perceptual<>relativ) you are
going to use for actual separating.
This would be a bug and not a feature. In the step from source RGB /
Lab to simulation / output space, your choice is perceptual or
relative colorimetric with relative black point (the lord forbid you
do it with absolute). No you have the colors that will print. Then in
the step from simulation / output space to monitor and printer proof
space your application software must *NOT* allow any color
displacement.
The bug in application software except Linocolor 6, Newcolor and
Pshop 6 is that the same intent is used in the first step as in the
second. If you choose Perceptual, you first gamut map into the
simulation / output CMYK space and then try to decompress the gamut
mapping going into the destination / proof space. The print will be
OK but the soft proof will be all over the place. If you choose
Relative Colorimetric with relative black point going into the
simulation / output CMYK space your shadows will not be rendered as
well as with perceptual, but at least they won't be massively
clipped, and your software will not give you the option to convert
into the monitor space, if it works at all. If it does, you're
entitled to ask for your money back -:).