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May 2007
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2007.05.14 21:24 "Re: JBIG2 in TIFF", by Bob Friesenhahn
On Mon, 14 May 2007, Lee Howard wrote: > Glenn Widener wrote: > >> JBIG2 compression in TIFF was only recently added as an extension to the >> TIFF/IT spec via an ISO addendum to TIFF/IT. As far as I'm aware, no >> attempt has been made yet to support it in tifflib (if anyone is thinking >> about this, I'd like to talk to them, as I'm interested in supporting it >> in SwiftView - just as we already support JBIG2 in PDF.) > > > CVS libtiff supports JBIG1 via JBIG-KIT. I don't think JBIG-KIT supports > JBIG2 yet. Unfortunately, JBIG-KIT is GPL licensed (not even LGPL). This makes it difficult to use in many cases. Some years ago, the JBIG-KIT author expressed concern to me that ImageMagick was using JBIG-KIT and RMS was involved in the discussion. The concern was if ImageMagick was violating GPL by using JBIG-KIT via a loadable module. RMS said that using a loadable module was not sufficient to avoid GPL. The upshot was that ImageMagick was in the clear since it was already observing GPL-required distribution rules. I have heard that use of JBIG2 is limited by patents. Bob ====================================== Bob Friesenhahn bfriesen@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/ GraphicsMagick Maintainer, http://www.GraphicsMagick.org/