JbigKit-1.5 for Windows

An MS-Windows (Win32) port of JbigKit-1.5 is available from

JBIG-KIT implements a highly effective data compression algorithm
for bi-level high-resolution images such as fax pages or scanned

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
<ing.davide.pizzolato@libero.it> 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

Posted by GnuWin 2003-06-29

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