Convering RGB input to HSL colour

I am trying to let a user define the colour of parts of their character. I was thinking the best way to do this would be allow them to input the red, green and blue values for each piece. I would then add these values through an effect to each individual piece. However, the effect I found required me to input the Hue, Saturation and light values for the colour. How can I convert the red, green, blue input to HSL? I can't use an algorithm I've found online because of the way the event system works.

I'm sorry for not directly answering your question, but I find that HSL values are actually a lot more user intuitive than RGB values. If a user wants 'dark purple' for example, in an RGB system this would require a bit of experimentation from those not educated in color theory. In an HSL system, It's easy to find 'purple' then 'dark' and adjust the saturation if need be.

can't use an algorithm I've found online because of the way the event system works.Nonsense, I made a capx a while back that used those algorithms and was able to implement it in events just fine.

http://dl.dropbox.com/u/5426011/examples15/color_mix.capx