[cairo] How to use a specified color as png transparent color?

Carlo defrag1986 at gmail.com
Wed Oct 26 03:51:55 PDT 2011

Hi. I would  import a png and copy it on a surface with the "target 
color" used as transparent color.
I'm working with different set of png, each set has a background color 
that I don't want to show.
How can I make this??

Thank you for help
Carlo Ferraresi

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