#### 3.25.54.1 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 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‘ and ‘negative‘ 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