⎗ image/jpx

File Extensions

jpf, jpx

Magic Bytes

1. JPEG 2000 signature (size + box code prefix) + ISOBMFF major brand prefix for JPEG 2000 Part 2

   Offset	0	1	2	3	4	20	21	22
   Byte	0x00	0x00	0x00	0x0c	0x6a	0x6a	0x70	0x78
   Char					j	j	p	x

References

• Media Type Assignment
• RFC 3745 - Extended Still Image Registration
• LOC Digital Formats - JPEG 2000 Part 2
• MP4RA Brands
• ISOBMFF Major Brand Explanation