Usage: overlay_psfiles [options] psfile1 psfile2 [psfile3 ...]
 
	overlay_psfiles overlays two postscript files of the same size
	into one SGI image and displays it. With the -m option it places the
	images in a movie.

	options:	-h 	=> this help screen 
			-r 	=> remove created temp files
			-m	=> create a movie.
			-o file => name export file to file.
			-f fmt  => Use fmt as input format.
				   See also man convert ...

	This script needs ImageMagick utilities (from freeware 2.0 CD).
	You also need to install the SGI imgtools.

Author: Olaf Corten, the Netherlands
E-Mail: olafc@molding.fico.nl or ocorten@knoware.nl

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# History:
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# 991019 Added -f fmt option.
# 991018 Added NETPBM_BIN.
# 980617 Added -m option.
# 980616 first version
#
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