3.25.54.6 gamma correction

For gray mappings gamma correction can be turned on by ‘set palette gamma <gamma>‘. <gamma> defaults to 1.5 which is quite suitable for most terminals.

The gamma correction is applied to the cubehelix color palette family, but not to other palette coloring schemes. However, you may easily implement gamma correction for explicit color functions.

Example:

      set palette model RGB
      set palette functions gray**0.64, gray**0.67, gray**0.70

To use gamma correction with interpolated gradients specify intermediate gray values with appropriate colors. Instead of

      set palette defined ( 0 0 0 0, 1 1 1 1 )

use e.g.

      set palette defined ( 0 0 0 0, 0.5 .73 .73 .73, 1 1 1 1 )

or even more intermediate points until the linear interpolation fits the "gamma corrected" interpolation well enough.

This document was generated on November 1, 2013 using texi2html 5.0.