RGB additive cube — what sensors measure and screens emitHSV the same colours in polar form — hue becomes a single axisCMYK subtractive — inks remove light; all three make muddy brown, so K is addedL*a*b* lightness vertical; the chroma axes are opponent pairs, perceptually spacedYCbCr luma vertical — a linear map, so the cube arrives sheared
click a solid to open it · drag rotate scroll zoom click sample a colour
drag to rotate · scroll or pinch to zoom · click the surface to sample