On Feb 5, 2009, at 14:28, Damien Cooke wrote:
I have what is probably a stupid problem. In my window I have a background NSImageView and I want to pop another much smaller one on top. The one I am putting on top is a png with transparencies. When I do this I get a rectangular image over my background but what I want to see is only the non transparent parts of my image. I have set the background colour of my image via [image setBackgroundColor: [NSColor clearColor]] but I am perplexed with the spectacular lack of any change.
Make sure you're using the correct mode, probably "source over". The default "copy" mode doesn't do what you might expect with transparency.
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