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Re: NSImage with alpha channel of other NSImage

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Re: NSImage with alpha channel of other NSImage

Subject: Re: NSImage with alpha channel of other NSImage
From: Ricky Sharp <email@hidden>
Date: Sat, 16 Sep 2006 13:39:24 -0500


On Sep 16, 2006, at 10:33 AM, Alexander Cohen wrote:

How can i get an NSImage of only the alpha channel of another NSImage?

I'll assume that the original NSImage will have an NSBitmapImageRep. Having said that, you could create a new NSBitmapImageRep and use direct pixel access on the original rep, and copy over the alpha value in triplicate to the new rep's RGB comps.

The following sample shows how to do direct pixel access:

<http://developer.apple.com/samplecode/Monochrome_Image/index.html>

Specifically, look at NSImage_monochrome.m. It would be easy to modify this category to suit your needs.

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  >NSImage with alpha channel of other NSImage (From: Alexander Cohen <email@hidden>)




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