ppmtospu(1) - phpMan

Ppmtospu User Manual(0)                                                   Ppmtospu User Manual(0)



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
       -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  programs  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  completely 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(0)

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