Thanks! I could find little information on HCL, but based on this blog post [0] it seems that it is a cylindrical version of CIE LUV. This is the color space th

Thanks! I could find little information on HCL, but based on this blog post [0] it seems that it is a cylindrical version of CIE LUV. This is the color space that HUSL is based on. What HUSL does is it replaces the chroma component with a saturation component that is defined as a percentage ranging from 0 to the maximum chroma for the given hue and lightness. To put it in another way, it stretches the chroma component to make it fit into a nice rectangle. This makes all components bounded and lets us pick color without stepping outside of the gamut. UPLab looks cool, thanks for sharing. [0] http://cscheid.net/blog/hcl_color_space_blues http://cscheid.net/blog/hcl_color_space_blues