rgbmax

Syntax:

     set rgbmax {1.0 | 255}
     unset rgbmax

The red/green/blue color components of an rgbimage plot are by default interpreted as integers in the range [0:255]. set rgbmax 1.0 tells the program that data values used to generate the color components of a plot with rgbimage or rgbalpha are floating point values in the range [0:1]. unset rgbmax returns to the default integer range [0:255].