gamma - grayscale filter

Blitz3D Forums/Blitz3D Programming/gamma - grayscale filter

Yes, ChrML, but that's very slooooooooooooooooow! :)

I guess Ed wants it for rendering a light/shadow map or something. I could do with this as well. Tried farting around with gamma tables but, frankly, they're a bloody mystery to me - the docs being about as much use as an ashtray on a motorbike, as they are. :P