Lispmtopgm User Manual(0)                            Lispmtopgm User Manual(0)


       lispmtopgm - convert a Lisp Machine bitmap file to PGM


       lispmtopgm [lispmfile]


       This program is part of Netpbm(1).

       listpmfile  reads  a  Lisp  Machine  bitmap as input and produces a PGM
       image 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
       monochrome instead and produce PGM.  This is unfortunate.


       pgmtolispm(1), pgm(1)


       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 proba-
       bly 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.


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

netpbm documentation             06 March 1990       Lispmtopgm User Manual(0)

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