gif2isd.icn: Program to produce a ISD from bi-level image

November 17, 2001; Ralph E. Griswold
This file is in the public domain.
This program takes a B&W GIF image whose name is given on the
command line and writes an ISD for a draft to standard output.

If the GIF is not strictly B&W, non-black pixels are assumed to
be white.

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