You can also use the subtract blendmode. BitmapData.draw supports using a blendmode, and subtract does exactly what you want.
--Brian On 8/21/07, Bojil Vassilev <[EMAIL PROTECTED]> wrote: > > Thank you both for the replies. There is some urgent stuff at work right > now, but I'll test more later and report what I found out. > Cheers. > > Danny Kodicek написа: > > > > > >> I have BitmapData A and BitmapData B; > >> Is there a fast routine that from every pixel in A will > >> subtract the color of the coresponding pixel in B? > >> I'm looking for a solution using the built-in BitmapData > >> functions, since a manual looop on every pixel will be > >> somewhat intensive (even if I use the getPixels>loop > >> ByteArray>setPixels hack to set the pixels, instead of a > >> setPixel() loop); > >> > > > > Interestingly, in Director this is easy using copyPixels and the > #subtract > > ink, so as the BitmapData object is essentially an updating of > Director's > > Image object, I'd have expected the same routine to be available in > Flash. > > Is there some undocumented parameter of the copyPixels function? > > > > Danny > > > > _______________________________________________ > > Flashcoders@chattyfig.figleaf.com > > To change your subscription options or search the archive: > > http://chattyfig.figleaf.com/mailman/listinfo/flashcoders > > > > Brought to you by Fig Leaf Software > > Premier Authorized Adobe Consulting and Training > > http://www.figleaf.com > > http://training.figleaf.com > > > > > > _______________________________________________ > Flashcoders@chattyfig.figleaf.com > To change your subscription options or search the archive: > http://chattyfig.figleaf.com/mailman/listinfo/flashcoders > > Brought to you by Fig Leaf Software > Premier Authorized Adobe Consulting and Training > http://www.figleaf.com > http://training.figleaf.com >
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