RGB24 with transparant color?

[M.C. Deurloo]

Hi,

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.

Thanks,

Marijn

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[Jonathan Morton]

You should convert your image in software to RGBA format.

2009/11/3 M.C. Deurloo <m.c.deurloo@...>

Hi,

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.

Thanks,

Marijn

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