Functions

Use set palette functions $<$Rexpr$>$, $<$Gexpr$>$, $<$Bexpr$>$ to define three formulae for the R(gray), G(gray) and B(gray) mapping. The three formulae may depend on the variable gray which will take values in [0,1] and should also produce values in [0,1]. Please note that $<$Rexpr$>$ might be a formula for the H-value if HSV color space has been chosen (same for all other formulae and color spaces).

Examples:

To produce a full color palette use:

     set palette model HSV functions gray, 1, 1

A nice black to gold palette:

     set palette model RGB functions 1.1*gray**0.25, gray**0.75, 0

A gamma-corrected black and white palette

     gamma = 2.2
     color(gray) = gray**(1./gamma)
     set palette model RGB functions color(gray), color(gray), color(gray)