[Image-SIG] Converting CMYK JPG image to RGB

kevin@cazabon.com kevin at cazabon.com
Fri Jun 17 16:40:41 CEST 2005

I know the problem you mention, but I also thought that a recent version of 
PIL fixed it... I could be wrong though.

However - the other option would be to use ICC profiles to do color 
conversion.  If you want REALLY accurate conversion, this is the way to go. 
I wrote a wrapper module called pyCMS that uses the littleCMS library to do 
ICC conversions.  See:  http://www.cazabon.com/pyCMS

----- Original Message ----- 
From: "marc birot" <mbirot at u-prod.com>
To: <image-sig at python.org>
Sent: Friday, June 17, 2005 6:01 AM
Subject: [Image-SIG] Converting CMYK JPG image to RGB

> Hello,
> I'm trying  to convert CMYK Jpg  files to RGB Jpg  files using
> (Image.open("cmyk_image.jpg").convert("RGB"))...
> The result shows very wrong colours.
> After checking the Image-SIG archives (Aug 2004) i found the following :
> "...Older versions of Photoshop generated broken CMYK files, and PIL
> attempts to compensate for this. try commenting out the following lines
> in PIL/JpegImagePlugin.py, and let me know if it helps:
> if self.mode == "CMYK" and self.info.has_key("adobe"):
>    rawmode = "CMYK;I" # Photoshop 2.5 is broken! ..."
> Well, i tried and it does not work. The result i get is close to a
> 'negative' of the original picture ( not too close).
> Any suggestion to help on this problem ?  :)
> Marc
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> Image-SIG maillist  -  Image-SIG at python.org
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