[Gimp-user] ICC Profiles: UFRaw + GIMP = 2x correction?

2012-01-30 Thread Gary Aitken

I have a question regarding the use of ICC profiles in UFRaw + GIMP.

If I load an image into UFRaw and specify an ICC profile for my camera,
then output a .tiff image, that image is color-corrected.  At least that 
is my assumption...


Now, if I load the .tiff image into GIMP, and again specify an ICC 
profile for the camera, the image is corrected again, I think.  Which 
amounts to over-correction.  Correct?


How do people handle this in their workflow?  Correct in UFRaw and use 
GIMP with no correction?


What happens when you specify an icc profile in UFRaw and then activate 
UFRaw from the GIMP?


Thanks for any insights,

Gary
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Re: [Gimp-user] ICC Profiles: UFRaw + GIMP = 2x correction?

2012-01-30 Thread Frank Gore
On Mon, Jan 30, 2012 at 7:50 PM, Gary Aitken ga...@dreamchaser.org wrote:
 I have a question regarding the use of ICC profiles in UFRaw + GIMP.

 If I load an image into UFRaw and specify an ICC profile for my camera,
 then output a .tiff image, that image is color-corrected.  At least that is
 my assumption...

 Now, if I load the .tiff image into GIMP, and again specify an ICC profile
 for the camera, the image is corrected again, I think.  Which amounts to
 over-correction.  Correct?

ICC is not a correction. It is a profile. It tells the application how
to interpret the colours that are encoded in the file. If you specify
an ICC profile in UFraw, that profile gets saved into the image file,
and Gimp uses that profile information when it opens the image file.
If you re-specify a new ICC profile within Gimp after you've opened
the image, you're not over-correcting anything, you're just doing an
extra useless step that results in nothing happening.

In your case, I'd say you've got absolutely no reason whatsoever to be
doing colour management. Sticking to standard sRGB for your entire
workflow would be entirely acceptable and would give you the best
results.

--
Frank Gore
THE place to talk photography!
www.FriendlyPhotoZone.com
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