Quote Originally Posted by Spam Butterfly
Native photoshop format (.psd) also supports alpha channels.

Hugh
you cant use native photoshop files - the alpha channel is pre-multiplied - or the wrong way round for me.
also layered photoshop files include a hidden composite layer - that overrides any alpha information when imported into catalyst.

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you need to use png and tiff.
this was explained in some detail many moons ago.
search for png in catvx