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Re: Create semi-transparent NSImage
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Re: Create semi-transparent NSImage


  • Subject: Re: Create semi-transparent NSImage
  • From: "I. Savant" <email@hidden>
  • Date: Tue, 28 Feb 2006 08:26:52 -0500


You should have kept reading the docs. :-) Use - compositeToPoint:operation:fraction: ... the operation and fraction are how you specify how to draw the image. -compositeToPoint: doesn't change anything - just composites the image as-is.


--
I.S.


On Feb 28, 2006, at 8:11 AM, Michael Petnuch wrote:

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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