Transparent GIFs

torrance@pompeii.east.sun.com (Mark Torrance - Sun BOS Sunlabs)

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Date: Wed, 29 Jun 1994 22:02:11 +0200
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From: torrance@pompeii.east.sun.com (Mark Torrance - Sun BOS Sunlabs)
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Subject: Transparent GIFs
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You can use the NetPBM utilities (a new and improved version of the
PBM+ utilities) to create GIFs with transparent colors.

You say this:

ppmtogif file.ppm -transparent rgb:f/f/f > file.gif

to produce file.gif with white marked as a transparent color.  Then
modern GIF viewers, including X Mosaic, will show the background color
instead of white.  See the manual page for more details.

I don't know the canonical place to get NetPBM; try archie.

--Mark Torrance
  Mark.Torrance@east.sun.com