2008/10/21 Fabrice <[EMAIL PROTECTED]>: > > this will not work cleanly. > if the image contains blue, it will alter the image creating the noise you > describe.
True. It sounded like Ben already had a bunch of JPG files he didn't want to alter, so I was trying to think of the quickest possible way for him to achieve blue == transparent in Actionscript. You're right about it not working cleanly, but, depending on the quality of the JPG, he might be able to get away with it. Failing that, a method like you describe for copying into an intermediate black&white bitmap could work, with thresholding: Step 1: copy original into a temp bitmap step 2: use bmd.threshold to set anything < threshold blue to #00000 step 3: use bmd.threshold to set anything > threshold blue to #FFFFFF step 4: copyChannel original jpeg alpha to temp bitmap R/G/B step 5: copyChannel temp bitmap R/G/B to original bmd alpha With a generous enough threshold it might just work? I'm just spouting stuff off the top of my head though, it would probably need a bit of tweaking (and maybe some blurring etc) to get right. Whatever works best, right? ;) h.
