lispmtopgm (1)
convert a Lisp Machine bitmap file into pgm format
SYNOPSIS
DESCRIPTION
Reads a Lisp Machine bitmap as input.
"Lisp Machine bitmap"
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
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.
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