[cairo] RGB24 with transparant color?

M.C. Deurloo m.c.deurloo at mail.com
Tue Nov 3 02:22:45 PST 2009


I am porting an application from GD to Cairo. I am using the perl-binding
for Cairo.

For some special use-case of the application (PNG used in a PDF
generator) I need PNG's with transparency in the PNG24-format (or
PNG-8?), not in the RGBA format (no transparancy in the alpha channels,
but a single transparent color). Can anyone point me in the right
direction for solving this? My PNG24 surface ends up with an all black
background instead of a transparent one.



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