The IcoImagePlugin is among the oldest code in PIL. Have a look at it,
all it does is finding out where the InfoHeader for the biggest icon
starts in the file (since an icon file can contain more than one image),
calls the BMP plugin with that, and then adjusts the image height. This
closely matches the structure in http://www.daubnet.com/formats/ICO.html
which is for pre-WinXP icon formats, I think. PIL plain ignores the
transparency which comes from the AND mask inherent to the ICO format.
The IcoImagePlugin should be consequently rewritten from scratch to
support things like the ContainerIO, if somebody cares. If you look at
http://www.blitzbasic.com/Community/posts.php?topic=75770 or the
Wikipedia article for the ICO file format you'll see that XP as well as
Vista extended the file format.
But unless somebody does this, here's a way for you to get the
transparency right when loading your icon:
i = Image.open("favicon.ico")
d, e, o, a = i.tile[0]
s = file("favicon.ico").read()
mask = Image.fromstring('1', i.size, s[o+e[2]*e[3]:], "raw", ('1;I', 4,
-1))
i.putalpha(mask)
i.save("test.png")
Cheers,
Karsten
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