[Image-SIG] Color problems with larger images

Florian Höch lists+Image_SIG at hoech.org
Thu Jul 10 13:30:26 CEST 2008

Yes, I can reproduce this using your example. Seems to happen only to 
images larger than real screen estate and looks like some kind of 
"palettization" (is that even a word?) error. But I think it's only a 
problem of ImageWin, not PIL in general. If you want to simply display 
the image, maybe im.show() is an option which will use the default image 
viewer of the OS?


Florian Höch

Eric O'Donnell schrieb:
> Hi,
> I'm getting some weird colour artifacts when I open larger images with
> PIL. Can't seem to find anything relevant in the archives.
> The code to replicate is pretty simple so I should just post that.
> #begin code block
> from PIL import Image, ImageWin
> filename = "Sumida_river05s3200.jpg"
> #http://upload.wikimedia.org/wikipedia/commons/c/c7/Sumida_river05s3200.jpg
> im = Image.open(filename)
> im.load()
> print im.mode
> w = ImageWin.ImageWindow(im)
> w.mainloop()
> #end code block
> The image is about 1.7 megabytes.
> I'm using PIL 1.1.6 with Python 2.5 on WindowsXP.
> If I shrink the image to half size in the GIMP, the colour distortion
> decreases. Shrink the original to a quarter size and the artifacts
> disappear. I thought this might be associated with CMYK problems from
> the archives, but none of the patches in the list changed the
> behavior, although they did fix the CMYK images linked. The image
> looks normal with other viewers.
> Any advice would be greatly appreciated.
> Thanks,
> Eric.
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