Transforms between color spaces.
vector ctransform(string fromspace, tospace; vector clr)vector ctransform(string tospace; vector clr)If you don’t give a fromspace, assumes
"cspace:rgb".
Transforms color tuple clr from one color space to another.
The possible arguments for fromspace and tospace are
"cspace:rgb", "cspace:hsl", "cspace:hsv", "cspace:XYZ",
and "cspace:Lab".