how to draw 2 image on pixmap with different transparent color?

From: "chen.shengqi" <chen shengqi connet com tw>
To: <gtk-app-devel-list gnome org>
Subject: how to draw 2 image on pixmap with different transparent color?
Date: Wed, 16 Oct 2002 13:15:45 +0800

Dear sirs:
    I come from windows. and want to write something with gtk on linux.
    I want to draw some image to pixmap with specified transparent color, the the images may are in 
4,16,256,65536... colors. How can I do this? where can I find examples on this?
    thanks.

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