JBIG2 Encoder

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This is an encoder for JBIG2.

JBIG2 encodes bi-level (1 bpp) images using a number of clever tricks to get
better compression than G4. This encoder can:

  - Generate JBIG2 files, or fragments for embedding in PDFs
  - Generic region encoding
  - Perform symbol extraction, classification and text region coding
  - Perform refinement coding and,
  - Compress multipage documents

It uses the (Apache-ish licensed) Leptonica library. Version 1.74 or later is required.

Known bugs

The refinement coding causes Acrobat to crash. It's not known if this is a bug
in Acrobat, though it may well be.

Usage

Note: Windows Command Prompt does not support wildcard expansion, so *.jpg will not work. You'll need to manually expand the file names yourself or you need to use the latest git code and MSVC build.

See the jbig2enc.h header for the high level API, or the jbig2 program for an
example of usage:

jbig2 -s -a -p -v -T 100 -b imgs images/*.jpg && python jbig2topdf.py imgs >out.pdf

or with standalone mode:

jbig2 -a -p -v images/feyn.tif > feyn.jb2 && python jbig2topdf.py -s feyn.jb2 > feyn.pdf

to encode jbig2 files for pdf creation.
If you want to encode an image and then view output first to include in pdf

jbig2 -s -S -p -v -O out.png images/*.jpg

If you want to encode an image as jbig2 (can be view in STDU Viewer on Windows) run:

jbig2 -s images/feyn.tif >feyn.jb2

Links

  - jbig2enc-samples
  - jbig2enc-minidjvu
