On 5/21/19 3:43 AM, Craig Sanders via gimp-developer-list wrote:
Hello.
I am writing a GIMP Plugin using Python, and I would like to know how my
Plugin can determine and/or set the Colour Profile of any image that it
operates on.
The reason I ask this, is because I have some PNG files which have been
generated from a PDF file by the ImageMagick convert utility. If I didn't
know better, I would say that this ImageMagick utility is embedding the
following Colour Profile into the images which it generates and stores in
the resulting PNG files;
Artifex Software sRGB ICC Profile
I also have some PNG files which have been generated by the gnuplot
utility. The images in these files have the following Colour Profile
embedded within them;
sRGB
When I copy and paste a gnuplot generated image into one of the other
images, the colours of the plots in the gnuplot generated image get altered
upon pasting. If I didn't know better, I'd say this is due to the
difference in the Colour Profiles, because if I load the PDF file straight
into GIMP and then inspect it - it has the sRGB Colour Profile. Then, when
I copy and paste the same gnuplot generated image into it, the colours of
the plots are correct!
I don't know a great deal about this subject material, so please excuse me
if I have asked something silly. I hope I have explained this clearly and
have provided sufficient information. Any assistance on this matter would
be greatly appreciated.
Another explanation is that the target PNG is color-indexed (if which
case whatever you paste in it has its colors coerced into those of the
colormap of the target).
Otherwise plenty of API to handle color profiles, in the Python console
(Filters>Python-fu>Console) hit "Browse...", then enter "profile" in the
search bar. If you use 2.10, best use the gimp_image* calls, the
plug-in-icc* seems to be carried over from previous versions for
compatibility.
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