Section: User Commands (1)
Updated: 06 March 1990
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lispmtopgm - convert a Lisp Machine bitmap file into pgm format
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.
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
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.
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Time: 18:32:21 GMT, January 21, 2018