> Those mystery numbers are actually the values that determine the make up 
> of the resulting channels so, in the example of XYZ -> RGB R is actually 
> made up of 0.412453 X, 0.357580 Y, 0.180423 Z ... its actually really 
> simple!

Yep, that's all matrix multiplication is, just a compact way of writing out 
those 3 equations of 3 variables :-)

BTW, the mappings that you can do by a matrix only convert to/from *linear* 
RGB.  When you show them on a display you need to gamma correct them (or if 
you get a bitmap from somewhere, you need to undo the gamma first before 
conversion).

> I'm thinking along the right axis you can do hue and saturation shifts. :D

Yup, look at the xy chromaticity diagram on that link, it should be easy to 
see geometrically what you need to do in order to get those shifts.

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