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.
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 *.jpg && python3 jbig2topdf.py output >out.pdf
or with standalone mode:
$ jbig2 -a -p -v images/feyn.tif > feyn.jb2 && python3 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 *.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