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Re: Pre-multiplied alpha


From: Pete French
Subject: Re: Pre-multiplied alpha
Date: Fri, 12 Dec 2003 13:13:59 +0000

> Does the image data stored in an NSBitmapImageRep have premultiplied
> alpha (aka associated alpha) or not (aka unassociated alpha)? The image
> data passed to NSDrawBitmap?

Its premultiplied in the image rep - if you pull the data out to do anything
with it then you treat it as such.

-bat.




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