pgmtopbm man page on CentOS

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Pgmtopbm User Manual(0)				       Pgmtopbm User Manual(0)

NAME
       pgmtopbm - convert a PGM image to PBM

SYNOPSIS
       pgmtopbm

       [-floyd	|  -fs	| -threshold | -hilbert | -dither8 | -d8 | -cluster3 |
       -c3 | -cluster4 | -c4 | -cluster8 | -c8]

       [-value val]

       [-clump size]

       [pgmfile]

DESCRIPTION
       This program is part of Netpbm(1).

       This  program  is  obsolete  since  Netpbm  10.23  (July	 2004).	   Use
       pamditherbw(1)todowhatthisprogram used to do.

       pgmtopbm	 never	was  the simple converter it appeared to be.  It was a
       dithering program.  Unfortunately, it didn't do the dithering  properly
       because	it treated the PGM input samples as if they were directly pro‐
       portional to light intensity, but they are actually gamma-adjusted.

       pamditherbw is backward compatible with pgmtopbm except that it

       ·      does the correct gamma adjustments.

       ·      produced PAM output instead of  PBM.   (Modern  Netpbm  programs
	      that  accept  PBM	 input	also accept PAM input, but if you need
	      actual PBM, you can use pamtopbm with pamditherbw).

	      So use the manual for pamditherbw for  pgmtopbm,	except	ignore
	      anything	that  says it was added after Netpbm Release 10.23 and
	      ignore any options that are not shown in the synopsis above.

netpbm documentation		 20 June 2004	       Pgmtopbm User Manual(0)
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