Re[4]: testing color browsers for ICC compatibility
Re[4]: testing color browsers for ICC compatibility
- Subject: Re[4]: testing color browsers for ICC compatibility
- From: Peter Karp <email@hidden>
- Date: Tue, 13 Dec 2005 09:08:45 +0100
Hi Marco,
> I believe that there is a bit of faulty logic at work here, together with
> some misunderstanding of how a monitor works within a color-managed
> workflow. Photoshop does not use the monitor profile to "render to images"
That was a typo and meant "render the images". Maybe I also have
choosen not the appropriate word (I'm not a native english speaker).
> (I assume you mean "to display images with accurate colors"): instead, it
> uses whichever color profile is embedded and/or assigned to the image (or
> the default color profile from your Color Settings if the image is
> untagged). After it interprets the colors according to that
> embedded/assigned/default profile, it sends those values to the monitor
> profile, which translates them on the fly while maintaining the intended
> appearance (according, I believe, to a relative colorimetric rendering
> intent).
Yes, that's the "normal" way PS displays an image.
> Why exactly would you wish to "take the monitor profile out of the PS chain"
Maybe this phrase was not appropriate too...
> anyway? That is doubly puzzling to me, because (a) it's not possible to take
> the monitor profile "out of the chain": the most you can do is assign a
> different profile to your monitor -- in your System Preferences -> Displays
->> Color tab --, but *some* monitor profile is *always* at work
Yes, in a colormanagement-savvy program. No, in a program which does
not honor (use) the monitor profile. Even OS X is not consistent
there. Detailed tests will show you some glitches. But getting better
from each major version to the next one.
It seems my posting was a little bit misunderstanding. It just meant:
If you want to send the "raw RGB" data of a file to the display you'll
have to either assign the monitor profile to the data or use the
softproof function in PS: Proofsetup--Monitor-RGB (or similar names, I
don't have an english PS version, so I don't know the exact words).
"Monitor-RGB" will temporarily assign the monitor profile to the image
data. This will in effect "switch colormanagement off -- don't use my
monitor profile to show me the 'real colors'" and you'll see the image
like you will see it in a non-colormanaged program (like Firefox). Of
course the corrections or "calibration" which is often loaded via the
vcgt (video card gamma tag) in the monitor profile, will still have an
effect. But the actual profile describing the monitor characteristics
will not be effective in PS then.
I hope that's clear now.
Best regards
Peter
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