Is there an animation format supported in Qt (using v4.4) that will support a full alpha channel? GIF only has one-bit transparency, and I don’t think Qt supports APNG. Update: MNG seems to be supported, but that’s even less popular than APNG! Maybe SVG is my best bet.
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Qt supports SVG 1.2 Tiny as well as GIF and MNG. On a side-note, an animation API is being worked on which might be interesting for you;
http://labs.trolltech.com/blogs/2008/11/05/qt-animation-framework/ and http://labs.trolltech.com/page/Projects/Graphics/Kinetic