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       lispmtopgm - convert a Lisp Machine bitmap file into pgm format


       lispmtopgm [lispmfile]


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

       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.


       pgmtolispm(1), pgm(5)


       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.


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

                                 06 March 1990                   lispmtopgm(1)