resize vs. thumbnail return values

[Fredrik Lundh]

Dinu C. Gherman <gherman at darwin.in-berlin.de> wrote:
> I wonder what the reasoning is behind making a difference 
> in the return value of Image.resize() and Image.thumbnail()? 
> resize() returns self while thumbnail returns None. 

the thumbnail modifies the image in place, while resize returns a
resized copy of the image, and leaves the original image intact.

why things are done this way is explained in the last section
in the tutorial:
http://www.pythonware.com/library/pil/handbook/intro01.htm

</F>

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