Ok, so my code is working fine - I can manipulate the colours however I want. But which colours do I change??
I've used xxd to look at common pixels, I've tried bring some out in different combinations, but I can't get the combo right! I can kinda see an image (and if I tilt my screen I can see who it is, but that's besides the point!). This is less about the code and more about manipulating colours, but I'd like to know as it's driving me crazy.