On 10/23/14 13:31, Keith Purtell wrote:
> I've been using GIMP for several years to (among other things) open TIFF
> files, edit, export into Acrobat Pro to create a PDF. Today I took a
> client PDF and saved it as high-res TIFF, fixed a problem, exported the
> revised TIFF and converted to PDF. I do this often.
> It wasn't until I got to looking at the new PDF that I noticed a big color
> shift in one section. There's a pale green box with darker forest-green
> text inside. Both shades of green looked like the saturation had been
> pumped way up. I backtracked, and finally realized this color shift was
> happening the instant GIMP opened the TIFF.
> Just to be clear, this is not a buggy TIFF from outside. I made it myself
> by take a normal PDF and using the Save-as-Image function. This didn't
> happen with the other three images from the same project. Experimenting
> with Mode made no difference.
I'm not certain, but my guess is the tiff file has an embedded color profile
other than whatever your gimp is set to, and the conversion option is
set to auto-convert without asking questions.
Open Edit/Preferences/Color Management and check what "RGB profile" is set
to and what "File Open behaviour" is set to.
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