lispmtopgm(1)                                                 General Commands Manual                                                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)