### Rgbformulae

For rgbformulae three suitable mapping functions have to be chosen. This is done via rgbformulae r,g,b. The available mapping functions are listed by show palette rgbformulae. Default is 7,5,15, some other examples are 3,11,6, 21,23,3 or 3,23,21. Negative numbers, like 3,-11,-6, mean inverted color (i.e. 1-gray passed into the formula, see also positive (p. ) and negative (p. ) options below).

Some nice schemes in RGB color space

      7,5,15   ... traditional pm3d (black-blue-red-yellow)
      3,11,6   ... green-red-violet
      23,28,3  ... ocean (green-blue-white); try also all other permutations
      21,22,23 ... hot (black-red-yellow-white)
      30,31,32 ... color printable on gray (black-blue-violet-yellow-white)
      33,13,10 ... rainbow (blue-green-yellow-red)
      34,35,36 ... AFM hot (black-red-yellow-white)

A full color palette in HSV color space

      3,2,2    ... red-yellow-green-cyan-blue-magenta-red

Please note that even if called rgbformulae the formulas might actually determine the H,S,V or X,Y,Z or ... color components as usual.

Use positive and negative to invert the figure colors.

Note that it is possible to find a set of the best matching rgbformulae for any other color scheme by the command

      show palette fit2rgbformulae