[Image-SIG] Converting images to palette mode

[Fredrik Lundh]

Does it always stop at the same image, or after roughly the same
number of images?  Have you checked for memory/cpu consumption during
the conversion (in case it's a leak).

</F>

2009/1/26 Lukas Orsin <lukas.orsin at infinit.sk>:
> Hi,
> We are converting much images (296,000 tiles) at size 256x256px from RGB to
> Palette mode.
> After about 200,000 converted images our simple program crashes with
> quantization error:
>
> ..processing 129.png
> ..processing 130.png
> Traceback (most recent call last):
>   File "C:\tmp\to8bit_folders_upgrade.py", line 35, in <module>
>     os.path.walk(cesta,start_image_crush, 'blablabla')
>   File "C:\ActivePython25\lib\ntpath.py", line 334, in walk
>     walk(name, func, arg)
>   File "C:\ActivePython25\lib\ntpath.py", line 334, in walk
>     walk(name, func, arg)
>   File "C:\ActivePython25\lib\ntpath.py", line 334, in walk
>     walk(name, func, arg)
>   File "C:\ActivePython25\lib\ntpath.py", line 334, in walk
>     walk(name, func, arg)
>   File "C:\ActivePython25\lib\ntpath.py", line 334, in walk
>     walk(name, func, arg)
>   File "C:\ActivePython25\lib\ntpath.py", line 328, in walk
>     func(arg, top, names)
>   File "C:\tmp\to8bit_folders_upgrade.py", line 29, in start_image_crush
>     im=im.convert('P', palette=Image.ADAPTIVE, colors=colors)
>   File "C:\ActivePython25\Lib\site-packages\PIL\Image.py", line 663, in
> convert
>     im = self.im.quantize(colors)
> ValueError: quantization error
>
> Could anybody know whats the matter?
> We are running at Windows 2003 R2 SP2 32bit / 3.5 GB RAM
> and using os.path.walk funcion.
>
> Lukas
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