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May 2007

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2007.05.13 17:47 "JBIG2 compressed TIF question about bpp", by T T
2007.05.13 18:27 "Re: JBIG2 compressed TIF question about bpp", by Toby Thain
2007.05.13 18:48 "Re: JBIG2 compressed TIF question about bpp", by T T
2007.05.13 19:22 "Re: JBIG2 compressed TIF question about bpp", by Toby Thain
2007.05.13 22:49 "Re: JBIG2 compressed TIF question about bpp", by T T
2007.05.14 17:18 "Re: JBIG2 in TIFF", by Glenn Widener
2007.05.14 17:55 "Re: JBIG2 in TIFF", by Lee Howard
2007.05.14 21:24 "Re: JBIG2 in TIFF", by Bob Friesenhahn
2007.05.14 23:05 "Re: JBIG2 in TIFF", by Glenn Widener

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/