Re: Editing profile black point?
Re: Editing profile black point?
- Subject: Re: Editing profile black point?
- From: Klaus Karcher <email@hidden>
- Date: Wed, 12 Nov 2003 17:59:10 +0100
- Organization: schrift & form GmbH
Terry Wyse wrote:
> Hello all,
>
> Is there a way to edit the black point in a profile? I'm using Gretag's
> Profile Editor and I don't see a clear method for doing that.
>
> My "problem" is that quite often my destination/proofer profile will
end up
> with a higher minimum L* value than my source/press profile causing
clipping
> of the shadows in a colorimetric rendering. Perceptual rendering "fixes"
> this problem but you lose the ability to do paper white simulation
plus it
> compromises the precise matching of process builds. I figure if I
could just
> bring the black point of the press profile closer to the proofer
profile I'd
> have this problem licked.
I am careful using the term "proof". If the minimum L of your printer is
significant higher then the minimum L of the printing process you want
to simulate, I would say your printer can not be used as proofer for
that process. But as far as my experience goes, this happens rarely.
For me an indispensable criterion for a proof is, that the gamut of the
proofer encloses completely the gamut of the printing process it simulates.
Of course Perceptual rendering shold fix your problem as this is its job
(by Spec), but i think you can't call something a proof if perceptual
rendering or any other gamut compression method is needed.
Instead of editing your poofer profile or even the press profile, I
would ask myself why the proofer does not reach the required black
point. Maybee something went wrong with the black generation setings or
ink limits (possibly already at the time the proofer was calibrated
and/or linearized)?
>
> If we just had an option for colorimetric rendering with black point
> compensation in these proofing RIPs, this wouldn't be a problem (and,
yes, I
> know that there's a couple of products that do but I'm using Best
ColorProof
> 4.6.3 at the moment).
As mentioned above, IMHO a print with need for black point compensation
is no proof.
Regards, Klaus Karcher
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