What’s quick way to invert the colors of a BitmapData channel. (eg. I want to invert the alpha channel (eg. a pixel that is 200 in alpha channel becomes 55…).
The reason is i’m copying this grayscale Perlinnoise smoke image and makig it such that the darker the color, the more transparent it is. (I’m using copyChannel.RED/GREEN/BLUE->CopyChannel.ALPHA). But right now, it’s the other way round at the moment (ie. the brighter the pixel, the more opaque it is.). I want it to be more transparent instead (inversely proportional), so if i could find simple & fast way invert the alpha channel, it would do me so much more good. (I need a fast method…performance is critical!)
