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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Gordon
Ahh, ok - yes, It's not supported because there's no standard way of mapping R,G and B to a single 8 bit value (same with 1, 2 and 4 bits). About the only thing you could reliably assume is white being all 1 and black being all 0 (or vice versa) which is what it does.
I've updated the docs here: https://github.com/espruino/Espruino/commit/8ef686d5f405abd5ed76e80dbaa8930c49b94f69
If you have some specific display that works another way, nothing stops you from just overriding
setColorwith your own implementation though...