BRIGHTEN

 

 Brighten or darken color map.

 

 

  BRIGHTEN(beta) replaces the current color map with a brighter

  or darker map involving essentially the same colors.  The map is

  brighter if 0 < beta <= 1 and darker if -1 <= beta < 0.

 

 

  BRIGHTEN(beta), followed by BRIGHTEN(-beta) restores the

  original map.

    

  map = BRIGHTEN(beta) returns a brighter or darker version of the

  color map currently being used without changing the display.

 

 

  newmap = BRIGHTEN(map,beta) returns a brighter or darker version

  of the specified color map without changing the display.