Last year, I managed to profile my Samsung 226CW monitor using an
Eye-One LT under Fedora 7 and the argylcms programs. When I told gimp
what the display profile was, the results looked plausible. At that
time I was using an early version of gimp 2.4.
But my monitor dimmed somewhat, and I wanted to redo the
calibration/profiling. But it doesn't seem to be working. I also
tried the same thing with a laptop running Ubuntu 8.04, and had similar
The process produces a calibration (look up table) which is loaded into
the video card and also a profile which a program such as gimp can use
to tell the display how to interpret colors. There are two ways to tell
gimp about the display profile, but it doesn't seem to matter which I
use. What happens on both machines is that gimp seems to be negating
the calibration (look up table) in the video card and then perhaps
applying some profiling to the result. So what I get with a gray scale
is the whatever tint the screen had without the look up table loaded;
red-magenta for the Fedora machine and blue-cyan for the laptop display.
So either I keep doing something entirely idiotic, or gimp color
management is doing the wrong thing. The versions of gimp I've been
having this problem with are 2.4% and up. My current Fedora version is
Supposedly Eye of Gnome can also use a display profile, and it in fact
it doesn't show such an effect. The gray scales look plausible, but they
might anyway, just with the calibration loaded in the video card and no
profiling. But, if Eye of Gnome allows for color management, I would
expect it to say something about it and possibly allow some
configuration, and I can't see any indication that it is doing that.
Is there some other method independent of gimp to check whether the
profiling is working?
Any suggestions would be appreciated.
Leonard Evens <l...@math.northwestern.edu>
Mathematics Department, Northwestern University
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