>Well, I just looked into the LViewPro and 2.0 and see that the model they propose are for colours only. There is a difficulty to select gray colour in the colours selector they provided. I do nto know about later versions. When you switch to the HSL mode, I see that vertically they change Hue and horisontally both Sat and Lum values are changed. This produces a table of colours that is not complete (no grey colours with all 3 values equal). For example, I do not see a way there to pick up colour RGB(128,128,128) that is a pure grey colour. You can add a line of grey colours to your table separartely.

I tried your approach. I personally don't know how you came up with that. That's pretty smart. You can try it from the Tools menu. Can you let me know if that is what we should obtain?