Im working on a Space Marine painter at this very moment. Figured out a way to make it work really easily and simply. No messing around with numbers, or trying to get that exact colour every time or waiting for the image to refresh.
I am also not going to be using the crazy amount of colours that the B&C one uses, but this one instead:
But without the gradients at the bottom. That will allow you to get the same colour quicker and easier and there is still 255 to choose from.
More stuff coming soon......