> But this will only give my grayscales. How can I make colored?

You can do this:

pigment {
average
pigment_map {
[1 function {f_r(x,y,z)} color_map {[0 rgb 0][1 rgb <1,0,0>*3]}]
[1 function {f_g(x,y,z)} color_map {[0 rgb 0][1 rgb <0,1,0>*3]}]
[1 function {f_b(x,y,z)} color_map {[0 rgb 0][1 rgb <0,0,1>*3]}]
}
}

 - Slime
 [ http://www.slimeland.com/ ]

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