Re: gamut warning failure
Re: gamut warning failure
- Subject: Re: gamut warning failure
- From: Marco Ugolini <email@hidden>
- Date: Mon, 16 Oct 2006 19:56:55 -0700
In a message dated 10/15/06 3:51 PM, eugene appert wrote:
> So , am I right in assuming that if both Colorthiink and Adobe are using the
> same table to ³infer² the gamut range of the output profile then there would
> be no explanation for any discrepancy between them?
Hi Eugene.
>From having used it and having seen it fail on numerous occasions, my sense
is that the Gamut Warning command in Photoshop is using a mechanism that is
only loosely related to the greatly more-precise one used by ColorThink.
ColorThink is a solidly ICC-compliant workhorse; Gamut Warning is probably
nothing of the sort. I trust that ColorThink is accurate, but I have no idea
what Photoshop's gamut warning is based on. Whatever it is, it's not
accurate.
> Strangely Photoshop seems to know an output profile colour is out of gamut
> even though gamut warning does not indicate it as such, since the difference
> is being picked up by soft proofing but not by the gamut warning.
I don't think it's strange. Fortunately for all of us, Photoshop honors and
implements color profiles correctly, from what I can tell, so that the soft
proofing and printing procedures are accurate to the extent possible with
ICC technologies at their present state of development.
My sense (purely a hunch) is that the gamut warning is an outdated mechanism
that is not based on ICC standards, and therefore sadly obsolete or in need
of major overhaul. (Wasn't it there even *before* ICC color management was
implemented in Photoshop in version 5? I'll need your help on that one,
because I can't remember precisely that far back now.)
> Personally what I find astonishing is how such fundamentally crucial
> information could be at the mercy of such an imprecise tool . I mean frankly,
> what is colour management for if not to properly administer the transition
> from data to ink?
Again, I suspect that the gamut warning tool is not using a properly
ICC-compliant mechanism. I would like to hear the opinion of other
better-connected "insiders" on that.
Regards.
--------------
Marco Ugolini
Mill Valley, CA
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