[Image-SIG] GUI with Transparency

[Matthew Nuzum]

On 7/2/05, Christian M. Jensen <christianj at implicitnetworks.com> wrote:
> Hello,
> 
> Does anyone know of a GUI toolkit that supports alpha blending using PNGs?
> 
> Thanks!
> Christian

Here is a snippet from a program that uses PIL to create a rectangle
with alpha-transparent drop shadow around it. (tmp is an image)

import Image
import ImageFilter
import ImageChops
import sys

# draw a filled rectangle on a white background that leaves 8 - 10 px of white
# around the outside edge of the rectangle
... 

# add the drop shadow
new = tmp.filter(ImageFilter.BLUR)

new = new.convert("RGBA")

c = new.convert("L")
c = ImageChops.invert(c)
bands = c.split()

new.putalpha(bands[0])
new.show()

-- 
Matthew Nuzum
www.bearfruit.org