NAME
     3color - 3 color combination

SYNOPSIS
     3color <red> <green> <blue> <outname>

DESCRIPTION
     3color combines three FITS images of equal size to a  single
     24 bit image in PPM format. All input files are first scaled
     to 256 gray levels before conversion  to  a  single  24  bit
     image file.

     Example:
     > 3color h2.fits feII.fits brg.fits orion.ppm

OPTIONS
     None

FILES
     Input files shall all comply with FITS  format.  The  output
     file  is  in  PPM  (Portable PixMap) format, which should be
     fairly easy to convert to any kind of more convenient  image
     format  for  export.  As  PPM  images are portable, they are
     bulky and usually not suitable for export.