NAME
====
  vg_brightness() - change brightness of actual colormap


SYNOPSIS
========
  int vg_brightness(int val)


DESCRIPTION
===========
  Changes the brightness of the actual colormap.

  val is a value between -63 and 62.
  -63 is the darkest value.
    0 is the default value.
   62 is the brightest value.


RETURN VALUE
============
  It returns the previous brightness value (from -63 to 62).


SEE ALSO
========
  Index
  Understanding colormap
  vg_load_colormap()
  vg_color_index()