How to use a specified color as png transparent color?

Carlo <[email protected]>
Newsgroups gmane.comp.lib.cairo
Message-ID <[email protected]>
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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