Rgbformulae

For rgbformulae three suitable mapping functions have to be chosen. This is done via rgbformulae 4#4r5#5,4#4g5#5,4#4b5#5. 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 4#4H5#5,4#4S5#5,4#4V5#5 or 4#4X5#5,4#4Y5#5,4#4Z5#5 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