Hi!
Small remark: ColorRGBToHLs requires version 5.0 of Internet Explorer.

>For starters... you can take a look at the following Windows API routines via the MSDN Library. It sounds like you want to use ColorRGBToHLS. In my code below, I have an example of retrieving the system 3D Color via GetSysColor, and then getting the hue/sat/lum of that color.