Hope it can help you.
I've realized that a 3d color picker must be interactive and needs some
(simple) mathematics and time (I haven't) to be performed.
Basic idea is to have a 256+256+256 cube with visible pixel colored by
coordinates (e.g. r=x, g=y, b=z), a button to rotate the cube and a pipe
tool to pick in depth the color, showing the section of the cube normal to
the pipe while the pipe is advancing in his interior. From the section the
color can be picked.

Have a nice day,
;-)
Paolo

> Cool! I actually made something similar, but not nearly as good as this. I
> didn't realize this already existed.

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