Re: Transparency with PNG on NSImageView
Re: Transparency with PNG on NSImageView
- Subject: Re: Transparency with PNG on NSImageView
- From: Quincey Morris <email@hidden>
- Date: Thu, 5 Feb 2009 15:25:51 -0800
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.
FWIW
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