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Create semi-transparent NSImage

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Create semi-transparent NSImage

Subject: Create semi-transparent NSImage
From: Michael Petnuch <email@hidden>
Date: Tue, 28 Feb 2006 08:11:22 -0500

Hello,

I am trying to create a semi-transparent thumbnail for my application when I perform drag and drop. The problem is, the source image is not transparent. I know that you can draw the NSImage transparent by using the compositeToPoint methods, but those do not actually change the data. I need the actual NSImage to contain the transparent image so that I can pass it to the function:

dragImage:at:offset:event:pasteboard:source:slideBack:

How does an application like iPhoto create the transparent thumbnail?

Thanks in advance.

---------------------------------------------------------------
Michael Petnuch
http://www.petnuch.com
email@hidden

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