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1994-03-01
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lispmtopgm(1) AMIGA (06 March 1990) 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.
Page 1 (printed 3/1/94)