Re: Profoto
Re: Profoto
- Subject: Re: Profoto
- From: email@hidden (Bruce Fraser)
- Date: Fri, 30 Nov 2001 16:09:09 -0700
At 6:31 PM -0500 11/30/01, Roberto Michelena wrote:
> No, you were right the first time. Source-to-PCS transform is always
Relative Colorimetric. PCS to output is where the rendering intents
come into play.
Is that a Photoshop peculiarity, or always true? I was under the impression
that profiles have a reverse perceptual (Device->PCS) table besides a
colorimetric one, and that table was supposed to have a little "expansion"
into it to compensate for the compression to take place at the other side.
And that table (reverse perceptual) is the one supposed to be used for
perceptual transform device-to-device (or workingspace->device).
The ever-questioned ignorance that one side of the transform has about the
other... Link profiles do have a purpose, after all, when done right.
-- Roberto Michelena
EOS S.A.
Lima, Peru
As far as I know, always true under any current implementation. The
ICC has been talking about bringing rendering intents into play on
the source-to-PCS transform, but as far as I know nobody has
implemented it, and there's still some controversy over whether the
emchanism should be exposed to the user. I've never, ever, seen a
profile perform gamut expansion...
Bruce
--
email@hidden
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