Re: An "enhanced" absolute colorimetric intent?
Re: An "enhanced" absolute colorimetric intent?
- Subject: Re: An "enhanced" absolute colorimetric intent?
- From: Graeme Gill <email@hidden>
- Date: Tue, 26 Jul 2005 12:36:33 +1000
- Organization: Argyll CMS
Marco Ugolini wrote:
Now, if this is so, then it would seem to me that the "enhanced" absolute
colorimetric intent mentioned in the quote above is no different from a
relative colorimetric intent pure and simple. If the two end up being the
same, why create this "enhanced AbsCol," and not just use RelCol instead?
And if the AbsCol intent ends up being "enhanced," what do we do when we
need to use it the old-fashioned way, WITHOUT enhancements?
This is rather confusing.
Bingo. You've got it. The only thing you missed is that effectively
the ICC has redefined their "Absolute colorimetric" in V4 to mean
"Absolute when applied to reflective or tansmissive media, but
not emissive media". Here's a little table I made to try and
understand it: ("Other" is for an alternate illuminant).
Actual Nominal Intent:
Effect V2 V4 Refl. V4 Emiss.
------ -- -------- ---------
Other Abs. - Real Abs. Real Abs.
D50 Abs. Absolute ICC Abs. Real Abs.
Relative Relative Relative ICC Abs.
Relative
Perceptual Perceptual Perceptual Perceptual
Saturation Saturation Saturation Saturation
Graeme Gill.
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