Re: Absolute Colorimetry not supported with Monitor Profiles in Photoshop?
Re: Absolute Colorimetry not supported with Monitor Profiles in Photoshop?
- Subject: Re: Absolute Colorimetry not supported with Monitor Profiles in Photoshop?
- From: email@hidden (Bruce Fraser)
- Date: Mon, 7 Jan 2002 21:31:33 -0800
At 10:56 PM -0500 1/7/02, Roger Breton wrote:
In Photoshop 6 > Edit > Color Settings > Conversion Options, the choice of
rendering intents usually affects the readout on the Info palette for a
given profile. If, for example, I open up an IT8.7/2 RGB image and Assign it
my Scanner profile, the Lab values displayed in the Info palette changes
according to my choice of rendering intent in Conversion Options. So is it
with Printer profiles.
But it does not seem to work that way with monitor profiles? I am
experimenting with ColorBlind Prove It! profiles that are LUT-based and I
discovered that no matter which rendering intent is set in Conversion
Options, when I Assign a monitor profile to some RGB image, the Lab readout
in the Info palette remains unchanged?. (Please do not ask me why I try do
to this other than for the purpose of testing the program)
Is this a phenomenon only applicable to LUT-type of monitor profile or is
this also applicable for Matrix/TRC-type profiles?
Matrix profiles have only one rendering intent. It's usually labelled
perceptual, but unless someone has taken heroic measures to build it
otherwise, it's really relative colorimetric.
LUT-based monitor profiles could, in theory, support multiple
rendering intents, but I've never seen one that does, and most apps
don't have a UI for selecting rendering to the monitor. Hence they're
generally relcol as well.
Bruce
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