Cmy is frequenty associated with color printing, and it's determined by the relation of colors cyan, magenta and yellow. Unlike Rgb, cmy is subtractive, meaning that higher values are associated with darker colors rather than light.
The Yxy color space expresses the Xyz color space in a different way, in terms of only x and y coordinates which allows for a 2d representation.
Color conversions performed using the open source ColorMine library.
Cool! Creating famous images from color palettes found in other images: http://t.co/H1OxefkOt0