Re: ProfileMaker Yellow problems
Re: ProfileMaker Yellow problems
- Subject: Re: ProfileMaker Yellow problems
- From: Lasse Seppälä <email@hidden>
- Date: Mon, 10 May 2004 12:51:03 +0300
Re: ProfileMaker Yellow problems
From: citizenray <email@hidden>
To: Peter Figen <email@hidden>, <email@hidden>
on 5/7/04 3:23 PM, Peter Figen at email@hidden wrote:
This has been a problem that I've seen on every single profile I've
built with
ProfileMaker,
>This issue in not unique to ProfileMaker. I've seen at least three
other
>packages build the same "greenish-yellow" in more than one shop with
>different makes and models of spectrophotometers.
>Peter Figen's solution of editing profiles is fitting and probably the
best
>quick-fix of the problem for the time being. Unfortunately, he has to
take
>the time (and therefore money) to make it work as well as we expect it
>should out-of-the-box.
>If the greenish-yellow is common to so many different packages and
imaging
>devices, maybe the problem is really in the original formula.
>It's interesting that I've seen the issue with "all things RGB
imaging" from
>photo paper, Pictrography, and even LVT. Peter says he sees it with
CMYK and
>inkjet also. Andrew says he doesn't notice the problem.
This problem is build in Lab-colorspace (and therefore in all
ICC-profiles, whether RGB or CMYK), as clearly stated on web-site of
Bruce Lindbloom:
(
http://www.brucelindbloom.com/)
There you must navigate to: /Calc/Munsell Display Calculator/blue
turns purple -problem.
For same reason as blue turns purple, yellows also turn greenish and
reds get orange shift. The amount of the shift depends on saturation of
the original and in what RGB-colorspace it is.
For developers there is also a kind of solution (and more info) in a
form of "Uniform Perceptual Lab Profile" for download (/info/Uniform
Perceptual Lab Profile), somebody really using it?
Profile editing is kind of solution (often brings some other problems),
but the best for now is to use softproofing and compensate hue-shifts.
Best way would be to build profiling software the way Bruce Lindbloom
advocates (or with some similar approach to the problem), so that end
users would have fewer worries with color-shifts.
ls
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