JBIG2 is a patent-encumbered standard for lossy and lossless compression of bi-level images.
A JBIG2 codestream may appear in a file by itself, or embedded in another format such as PDF.
JBIG2 files begin with an 8-byte signature:
97 4A 42 32 0D 0A 1A 0A.
- JBIG (predecessor format)