Lch is similar to it's cousin Cie-L*ab, except that it's been rearranged in the shape of a sphere which makes it useful for applications like high-end photo editing and retouching images. Read more about it here
Cmyk is similar to the Cmy color space, with the addition of black (k). In theory the black component is not necessary, however this color space is primarily used in color printing where the mixture of cyan, magenta, and yellow result in a brown color rather than black.
We'll be adding support for ICC profiles to this page soon, but it's already available on our color converter page.
Color conversions performed using the open source ColorMine library.
Cool! Creating famous images from color palettes found in other images: http://t.co/H1OxefkOt0