have you any plans to implement a Colour space, which represents how humans perceive Colour? I am thinking about the CIE LCH space or the CIE LAB space, which Photoshop uses. Here is an explanation on Wikipedia: https://en.wikipedia.org/wiki/Lab_color_space
I think, such a tool could be handy for automated colour selection (i.e. to find constrasting colours for menus and the like).