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