Re:Kodak CMM in Photoshop
Re:Kodak CMM in Photoshop
- Subject: Re:Kodak CMM in Photoshop
- From: Chris Cox <email@hidden>
- Date: Sat, 21 Apr 2001 15:48:17 -0700
At 10:05 PM -0700 4/20/01, email@hidden wrote:
Message: 5
Date: Fri, 20 Apr 2001 12:40:57 -0400
Subject: Re:Kodak CMM in Photoshop
From: Dan Sutton <email@hidden>
To: <email@hidden>
I'm sorry if this has been mentioned before, I'm fairly new to this forum
and this is my first post. Since to upgrade to Photoshop 6 and all of its
wonderful color settings, I have noticed a problem. We have always used the
Kodak CMM but since version 6 there seems to be a conversion problem. I'm no
color expert, but I think it has to do with the white point shifting because
all of a sudden we cannot have a pure white (0000 CMYK, or 255255255 RGB),
it is "out of Gamut". It converts to 1,1,1,0 and 254,254,254 respectively. I
switched over to the Apple CMM and have no problems. Now I read somewhere
that you can edit a CMM in like a text editor and "tweak it", but I don't
think I really want to do that. I know its not corrupt because it happens
the same on multiple computers. My concern is 1) should(could?) the white
point be off in a CMM (esp. One that has been used thoroughly in the past)
and 2) I have heard the Apple CMM is very similar to Kodak's but maybe I
should "shop around" to see if there is a better option out there, or if it
even makes that much of a difference. For now, I'm sticking with Apple until
I see something I don't like about it.
It's a combination of problems in ColorSync and the Kodak CMM, and
could also be a bad profile (we're finding lots of profiles that
don't seem to grasp the ICC definition of white in 16bit LAB).
CMMs are code - you cannot edit or tweak them.
And you really should be using the Adobe CMM (ACE) for best results.
Chris