It is Cubic, generated by "Trigits" (ternary digits)
This palette is used by the [[CPC|Amstrad CPC]] old series only and is almost not found in any other computers (but clones of course). The Toshiba [[PASOPIA 7]] is known to feature the same 3-level RGB palette as the Amstrad CPC, its video mdoes are different than Amstrad CPC's ones though.
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This kind of picture can be obtained on a real CPC (through mode0 and Rasters) in order to test the monitors, aand also to understand at first sight how the Colours logic works.
*The Toshiba [[PASOPIA 7]] is known to feature the same 3-values RGB palette as the Amstrad CPC, its video mdoes are different than Amstrad CPC's ones though.
==='''12-bit RGB of the PLUS'''===