[Image-SIG] [raclette] that JPEG CMYK thing, again

Michael van Tellingen michaelvantellingen at gmail.com
Tue Mar 24 09:54:07 CET 2009

On Sat, Mar 7, 2009 at 01:26, Fredrik Lundh <fredrik at pythonware.com> wrote:

> Thanks to Tim and Charlie, I now have a set of nice Photoshop CMYK
> samples to play with.  The first result is a revamp of Kevin's CMYK
> patch; I'm now doing the inversion at the codec levels, both when
> reading and writing.  Also, the code *always* assumes Adobe behaviour,
> in both directions.  The current version of the plugin is here:
> http://bitbucket.org/effbot/pil-2009-raclette/src/e351bc0228c4/PIL/JpegImagePlugin.py
> I *think* this does the right thing, but I'm not 100% sure.  In other
> words, it would be helpful if those of you who've struggled with CMYK
> stuff can take this version for a test drive; it should work just fine
> together with a standard 1.1.6.

Hi Fredrik,

I've just tested my application with the PIL 1.1.7 tip and latest alpha and
still have problems with the conversion from CMYK jpeg to RGB.
The test images mailed earlier on this mailinglist (black background with
the text 'RED') somehow become yellow on my system (python 2.5 / osx
(this worked fine with the earlier patches I used for 1.1.6 from Kevin

The output of the pil setup summary:

    version       1.1.7a0
    platform      darwin 2.5.1 (r251:54863, Jan 13 2009, 10:26:13)
                  [GCC 4.0.1 (Apple Inc. build 5465)]
    --- TKINTER support available
    --- JPEG support available
    --- ZLIB (PNG/ZIP) support available
    --- FREETYPE2 support available
    --- LITTLECMS support available

I have a couple of photos with which i have the problems. I could mail you
these directly if you want.


> </F>
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