Setting the corner color in rotated PIL images

[rzed]

"Fredrik Lundh" <fredrik at pythonware.com> wrote in
news:mailman.97.1115384328.29826.python-list at python.org: 

> "rzed" wrote:
> 
>> I'm using PIL to generate some images which may be rotated at
>> the user's option. When they are rotated, the original image is
>> cropped in the new image (which is fine), and the corners are
>> black (which is not, in this case). I can't find any documented
>> way to change the default fill color (if that's what it is) for
>> the corners, and PIL also doesn't seem to support a flood fill.
>> I have created a flood fill in Python, which works but which
>> markedly slows image generation.
>>
>> Can anyone suggest a better way to set the color of the
>> corners? 
> 
> if you're doing this on RGB images, the quickest way to do this
> is: 
> 
>     def rotate(image, angle, color):
>         bg = Image.new("RGB", image.size, color)
>         im = image.convert("RGBA").rotate(angle)
>         bg.paste(im, im)
>         return bg
> 
> here's a more general solution:
> 
>     def rotate(image, angle, color, filter=Image.NEAREST):
>         if image.mode == "P" or filter == Image.NEAREST:
>             matte = Image.new("1", image.size, 1) # mask
>         else:
>             matte = Image.new("L", image.size, 255) # true matte
>         bg = Image.new(image.mode, image.size, color)
>         bg.paste(
>             image.rotate(angle, filter),
>             matte.rotate(angle, filter)
>             )
>         return bg
> 
> </F> 
> 
Fredrik:

Thank you for the reply. It just showed up on my server, and, of 
course, it works perfectly.

-- 
rzed