An MS-Windows (Win32) port of JbigKit-1.5 is available from
http://gnuwin32.sourceforge.net
JBIG-KIT implements a highly effective data compression algorithm
for bi-level high-resolution images such as fax pages or scanned
documents.
JBIG-KIT provides a portable library of compression and decompression
functions with a documented interface that you can very easily include
into your image or document processing software. In addition, JBIG-KIT
provides ready-to-use compression and decompression programs with a
simple command line interface (similar to the converters found in netpbm).
Changes between 1.4 and 1.5:
- fixed two minor memory leaks (special thanks to Davide Pizzolato
<[EMAIL PROTECTED]> for locating one of these)
- jbgtopbm does not attempt any more to parse multiple concatenated
BIEs (options -m must be used now to enable this feature explicitely),
in order to handle BIEs with data after the last expected SDE gracefully
- various extensions to improve support of JBIG fax applications
(ITU-T T.85 profile):
o support for maximum adaptive template pixel offset increased
to MX=127 in both encoder and decoder
o encoder now has a hook for producing BIEs with a NEWLEN marker
segment and VLENGHTH=1, in order to assist in testing decoders
for T.85 conformance (see also new pbmtojbg option -Y)
o a new function jbg_newlen() can be used to scan an
entire in-memory BIE for NEWLEN marker segments and update the
YD value in the BIE header, which can be applied to BIE data
before passing it to the decoder for T.85 compliance
(Background: the incremental design of the JBIG-KIT decoder
makes it infeasible to look ahead for NEWLEN marker segments
that occur after the SDE with the last image line, therefore
this second pass is necessary to handle the old-style fax
applications permitted by T.85 in which the low-RAM encoder
doesn't know the height of the image at the start of
transmission)
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