Manual: ppmtospu

Ppmtospu User Manual(1)				   General Commands Manual			     Ppmtospu User Manual(1)

NAME
       ppmtospu - convert a PPM image to an Atari Spectrum 512 image

SYNOPSIS
       ppmtospu

       [-d0|-d2|-d4] [ppmfile]

       All  options  can  be  abbreviated to their shortest unique prefix.  You may use two hyphens instead of one.  You may
       separate an option name and its value with white space instead of an equals sign.

DESCRIPTION
       This program is part of Netpbm(1).

       This program converts from the PPM format to the uncompressed Spectrum 512 image format used on Atari ST computers.

       Input comes from the file you name with the ppmfile argument, or Standard Input by default.  Output goes to  Standard
       Output.

       The  input  must be 320 pixels wide by 200 pixels high.	If you have an image of a different size, you can use pamcut
       or pamscale to force it to these dimensions.

OPTIONS
       In addition to the options common to all programs based on libnetpbm (most notably  -quiet,  see	  Common Options  ),
       ppmtospu recognizes the following command line options:

       -d0    The program does no dithering.

       -d2    The program uses a 2x2 ordered dither.

	      This is the default.

       -d4    The program uses a 4x4 ordered dither.

SEE ALSO
       sputoppm(1), spctoppm(1), pamscale(1), pamcut(1), ppm(1)

AUTHOR
       Copyright (C) 1990 by Steve Belczyk

HISTORY
       This program was new in Netpbm 10.58 (March 2012).

       But it was written in 1990.  Steve Belczyk posted it along with sputoppm, spctoppm, pi1toppm, and pi1toppm - all pro‐
       grams  for dealing with Atari image formats - to comp.sources.misc on July 15, 1990.  For reasons that have been lost
       to history, all of these entered the Netpbm (then Pbmplus) distribution except ppmtospu.

       Georges Kesseler wondered In March 2012 why there was no counterpart to sputoppm in  Netpbm  and	 searched  the	web,
       finding	only  one  reference to ppmtopsu: the 1990 comp.sources.misc posting, including the source code.  He emailed
       the Netpbm maintainer suggesting it be added.

       Bryan Henderson found the source code to be extremely primitive, not even using common library code.  So	 Bryan	com‐
       pletely recoded it, but retained nearly all of the original logic.

DOCUMENT SOURCE
       This manual page was generated by the Netpbm tool 'makeman' from HTML source.  The master documentation is at

	      http://netpbm.sourceforge.net/doc/ppmtospu.html

netpbm documentation					08 March 2012				     Ppmtospu User Manual(1)