HunterLab is similar to Cie-L*ab. Both are based on Xyz but HunterLab's color coordinates are based around a square root transformation rather than a cube.
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
Color conversions performed using the open source ColorMine library.
Cool! Creating famous images from color palettes found in other images: http://t.co/H1OxefkOt0