HTJ2K

File Format
Name	HTJ2K
Ontology	Electronic File Formats Graphics JPEG 2000 HTJ2K
Extension(s)	.jph
MIME Type(s)	image/jph

High throughput JPEG 2000 (HTJ2K) is a updated standard which speeds up encoding by an order of magnitude.

Format Information

JPH files are based on the Boxes/atoms format like JP2, you can find the specifications here

Software

• https://github.com/osamu620/OpenHTJ2K
• https://github.com/aous72/OpenJPH