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lispmtopgm(1)


NAME

   lispmtopgm - convert a Lisp Machine bitmap file into pgm format

SYNOPSIS

   lispmtopgm [lispmfile]

DESCRIPTION

   Reads  a  Lisp Machine bitmap as input.  Produces a portable graymap as
   output.

   This is the file format written by the tv:write-bit-array-file function
   on TI Explorer and Symbolics lisp machines.

   Multi-plane  bitmaps  on  lisp  machines are color; but the lispm image
   file format does not include a color map, so we  must  treat  it  as  a
   graymap instead.  This is unfortunate.

SEE ALSO

   pgmtolispm(1), pgm(5)

BUGS

   The Lispm bitmap file format is a bit quirky;  Usually the image in the
   file has its width rounded up to the next higher multiple  of  32,  but
   not  always.   If the width is not a multiple of 32, we don't deal with
   it properly, but because  of  the  Lispm  microcode,  such  arrays  are
   probably not image data anyway.

   Also,  the  lispm code for saving bitmaps has a bug, in that if you are
   writing a bitmap which is not mod32 across, the file may  be  up  to  7
   bits  too  short!   They  round down instead of up, and we don't handle
   this bug gracefully.

   No color.

AUTHOR

   Copyright (C) 1991 by Jamie Zawinski and Jef Poskanzer.

                             06 March 1990                   lispmtopgm(1)



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