Re: preview/photoshop
Re: preview/photoshop
- Subject: Re: preview/photoshop
- From: Chris Murphy <email@hidden>
- Date: Thu, 13 Jan 2005 13:02:38 -0700
On Jan 13, 2005, at 12:30 PM, Doreen Pearsall wrote:
Photoshop always uses ACE as the CMM when performing display
compensation. Photoshop also uses Relative Colorimetric rendering to
the display.
Does that mean the Photoshop engine and intent conversion options do
not apply when performing display compensation?
Correct. You can change the rendering intent to the display somewhat in
Proof Setup. The options there are Relative Colorimetric w/o Black
Point Compensation, Relative Colorimetric w/ Black Point Compensation,
and Absolute Colorimetric; controlled by the Simulate Ink Black and
Paper White options.
In any case, the color differences I am talking about are not the
slight changes that are visible when using different conversion
engines. I was not able to reproduce the distinct color shifts I am
getting on another mac user's system -- even when my profiles were
used on that system. Also, when I used that mac user's display
profile on my system -- while my overall color was off -- I still had
the distinct color shift between preview and photoshop.
I don't trust Preview when it comes to color management, and I'd
suggest you take it with a grain of salt also. Any application that
converts files on open and then saves them out with incorrect profiles
embedded depending on what image format you select is on the avoid
trusting this app list. The fact that it's still busted in 10.3.7 tells
me these sorts of major, saboteur-level bugs, are not a priority for
Apple. If it were important to them, they'd get it fixed like they fix
all kinds of other things with each of these bug fix updates. But we've
been going on over a year with serious Preview bugs, so clearly it's
not being positioned as an application that we should take seriously
when it comes to color management. (The fact that Quartz Filters are
still mostly broken also, is another thing that we're clearly being
told we shouldn't take seriously either.)
What is stranger is that all is working fine this morning.....this is
the second time I have had this problem and no amount of sleuthing
over a period of weeks helps me discover the source.....then suddenly
it starts to work one day. Last night when I stopped working I
definitely had the problem and when I woke up this morning it was gone
---- so I truly have no idea what causes it or what makes it stop.
If I have an image with a monkey in it and hand it off to Preview, I'm
confident Preview will display an image with a monkey in it. But that's
as far as I'd trust it.
Chris Murphy
Color Remedies (TM)
www.colorremedies.com/realworldcolor
-------------------------------------------------------------
Co-author "Real World Color Management, 2nd Edition"
Published by PeachPit Press (ISBN 0-321-26722-2)
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