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[REBOL] Re: Alpha channel of image! type

From: greggirwin:mindspring at: 14-Nov-2002 11:09

Hi Claude, CP> I looked everywhere (REBOL's site, eScribe, Google) to find how to access CP> the alpha channel in REBOL/View's image! type. What I want to do separate CP> all 4 channel into blocks or lists or arrays, whichever is most efficient CP> for later processing... and do it fast! Any clue is welcome. Something along these lines? img: load %bay.jpg block: reduce ['r copy [] 'g copy [] 'b copy [] 'a copy []] foreach [r g b a] img [ append block/r r append block/g g append block/b b append block/a a ] What will work best depends on what processing you're doing later and what your actual time constraints are. -- Gregg