rawtopgm man page on DigitalUNIX

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rawtopgm(1)							   rawtopgm(1)

       rawtopgm - convert raw grayscale bytes into a portable graymap

       rawtopgm	 [-headerskip  N] [-rowskip N] [-tb|-topbottom] [width height]

       Reads raw grayscale bytes as input.  Produces  a	 portable  graymap  as
       output.	 The input file is just grayscale bytes.  If you don't specify
       the width and height on the command line, the program  will  check  the
       size  of	 the  image  and try to make a quadratic image of it. It is an
       error to supply a non quadratic	image  without	specifying  width  and
       height.	The maxval is assumed to be 255.

	      If the file has a header, you can use this flag to skip over it.

	      If  there	 is  padding  at the ends of the rows, you can skip it
	      with this flag.  Note that rowskip can be a real number.	 Amaz‐
	      ingly,  I once had an image with 0.376 bytes of padding per row.
	      This turned out to be due to a file-transfer problem, but I  was
	      still able to read the image.

       -tb -topbottom
	      Flips  the  image upside down.  The first pixel in a pgm file is
	      in the lower left corner of  the	image.	 For  conversion  from
	      images  with  the first pixel in the upper left corner (e.g. the
	      Molecular Dynamics and Leica confocal formats)  this  flips  the
	      image  right.   This  is equivalent to rawtopgm [file] | pnmflip
	      -tb .

       If you don't specify the image width and height, the program  will  try
       to  read the entire image to a memory buffer. If you get a message that
       states that you are out of memory, try to specify the width and	height
       on the command line. Also, the -tb option consumes much memory.

       pgm(5), rawtoppm(1), pnmflip(1)

       Copyright (C) 1989 by Jef Poskanzer.
       Modified June 1993 by Oliver Trepte, oliver@fysik4.kth.se

				 15 June 1993			   rawtopgm(1)

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