HTML5 Deep Dive - advanced Canvas tricks and resources

i shamelessly use this opportunity to cross reference to a canvas related question (from myself) on stackoverflow http://stackoverflow.com/questions/7511321/uploading-base64-... even though i'm aware of the fact that i will be un-karma-ed into oblivion. but i'm quite desperate to get some help on this. thx

The inversion example only inverts the R channel, then uses the uninverted R value for G and B...