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Trinary image compression

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I very much like the idea of JBIG and the compression of binary
(black, white, but no gray or other colors) images.

There are, however, some books, at least computer manuals,
written with two ink colors. (Black and blue for example.)

There is, as far as I know, no JTIG compression for trinary
(black, blue, white) images. (Presumably one could allow for
any three colors, likely one being white.)

More specifcally, there are many DEC manuals in bitsavers
that have lost some bits in scanning. If there was a format
to store them in, there might be more interest in doing it.

-- glen

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Trinary image compression glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2012-10-22 19:22 +0000
  Re: Trinary image compression Willem <willem@turtle.stack.nl> - 2012-10-22 20:53 +0000
    Re: Trinary image compression glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2012-10-22 23:43 +0000
      Re: Trinary image compression Niels Fröhling <spamtrap@adsignum.com> - 2012-10-22 20:41 -0600
    Re: Trinary image compression Thomas Richter <thor@math.tu-berlin.de> - 2012-10-23 08:39 +0200
      Re: Trinary image compression glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2012-10-23 06:59 +0000

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