[Image-SIG] rotate image with transparent background?

[Alec Bennett]

Hmm, still getting a black box. The code as it stands now in case
anything jumps out at you:


from PIL import Image

collage = Image.open("collage.jpg")

# open the pic and give it an alpha channel so it's transparent
im1 = Image.open("pic1.jpg")
im1.convert('RGBA')

# rotate it and expand it's canvass so the corners don't get cut off:
im2 = im1.rotate(32, expand = 1)

collage.paste(im2, (30, 30) )
collage.save("collage.jpg")

collage.show()




On 1/17/07, Douglas Bagnall <douglas at paradise.net.nz> wrote:
> hi Alec,
>
> > I'm trying to rotate an image and have the expanded background be transparent.
>
> The image you get from opening a JPG won't have an alpha channel. You
> need to add it yourself with the .convert() method.
>
> This ought to work:
>
> im = Image.open("pic1.jpg").convert('RGBA')
> im2 = im.rotate(32, expand = 1)
> im2.show()
>
>
>
> Douglas Bagnall
>