PIL: Want to convert images into HSL format

[F. GEIGER]

PIL can supply me with RGB data of an image. Does anybody know, how I can
PIL have to transform this into the HSL (aka HSI) model?

I'm new to image processing, but if I understand the chapter Introducint
PIL -> Concepts -> Mode right, HSL is not mentioned there. Well, I have to
admit, the only two color modes of the mentioned ones I understand are RGB
and CMYK.

Any idea?

Cheers
Franz GEIGER