I see what you are saying, but 8 level grayscale does not work exactly as you said. It's 7 cycles, not 9. Plane0 Plane1 Plane2 (4/7) (2/7) (1/7) [number of cycles out of 7] 0 0 0 White 0 0 1 Very Light Grey 0 1 0 Light Grey 0 1 1 Dark Light Grey 1 0 0 Light Dark Grey 1 0 1 Dark Grey 1 1 0 Very Dark Grey 1 1 1 Black