[Image-SIG] image.transform() data outside image boundaries
Fredrik Lundh
fredrik at pythonware.com
Tue Mar 6 11:55:42 CET 2007
Christopher Schmidt wrote:
> When using image.transform, (EXTENT mode) it is possible to select an area
> which contains pixels outside the image:
>
> out = im.transform((0,100), Image.EXTENT, (-50, -50, 50, 50))
>
> Is there a way to make these pixels transparent, or set their color in
> some way?
there's no direct way to do this in the current version of PIL, but you can get
the effect you're after by doing things in three steps:
# transform the main image
main = im.transform(size, mode, params)
# create a mask
mask = Image.new("L", im.size, 255).transform(size, mode, params)
# paste the image onto an output image using the mask
out = Image.new(mode, size, background)
out.paste(main, mask)
</F>
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