some new updates

Hey Everyone, I've pushed some changes to my master branch on github which yields a 30x speed improvement for the colormixer on large images. I did it by implementing a LUT for the conversion operations (something I should have done from the beginning). Thanks to Guy Kloss for giving me the idea! If you have time, please check it out and give it a reaming. I'm still looking for an efficient way to make a LUT for HSV manipulations, any ideas are welcome! Cheers! Chris