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:
http://leptonica.com/

You'll need version 1.68.

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

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

$ jbig2 -s -a -p -v *.jpg && python3 jbig2topdf.py output >out.pdf

or with standalone mode:

$ jbig2 -a -p -v images/feyn.tif > feyn.jbig2 && python3 jbig2topdf.py -s feyn.jbig2 > 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 *.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
