Re: Evaluation of Color Difference Formulas
Re: Evaluation of Color Difference Formulas
- Subject: Re: Evaluation of Color Difference Formulas
- From: Klaus Karcher <email@hidden>
- Date: Thu, 19 Jul 2007 21:44:38 +0200
Marco Ugolini wrote:
In a message dated Jul 19, 2007 5:04 AM, Klaus Karcher wrote:
Or is [Timo Autiokari] just right? -- and what we call a
"softproof" is simply nonsense?
There's a way to gauge that: [...]
if your soft- and hard-proof match (reasonably, that is, given
that one is on an emissive medium and the other on a reflective
medium), and they both give you an acceptable preview of the results
on press, then...should we care what Timo says?
There's really no need to make it much more complicated than that. It
either works or it doesn't.
Softproofs work for me in most situations, but lately I often have to
assess color *differences* on screen (in the context of data migration
from FOGRA27 to FOGRA39) and I am sometimes astonished how different my
conclusions are when I see a hard-proof: little-noticed differences on
screen sometimes seem to be much larger on a hard-proof and vice versa
(even though there are no gamut clipping issues). I use a
well-calibrated CG210 next to an adjustable desktop viewer and an
ISO-3664 P1 viewing booth for proof evaluation. Our proofing system is
reasonable smooth an well within the new FOGRA tolerances, so I don't
think this is only caused by hardware deficiencies or metamerism failures.
In my experience, and in that of others I work with, it works. It may
not be "working" if what you expect is a 100% match, but then again,
you may have to reassess your level of expectations, in that case.
looks like I have to :(
I think I will re-render the color list mentioned in my previous post as
16bpc-TIF, excluding all out-of-screen-gamut colors and take a closer
look to soft- and hard-proofs of it.
Regards,
Klaus Karcher
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