JPX

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File Format
Name JPX
Ontology
Extension(s) .jpf, .jpx
MIME Type(s) image/jpx
LoCFDD fdd000154
PRONOM fmt/151

JPX is a complex and versatile image file format, defined in Part 2 of the JPEG2000 standard (ISO/IEC 15444-2).

It is an extension of JP2 format. In addition to the JP2 feature set, JPX also offers:

The JPX specification is so large and difficult that its creators felt the need to define a simpler subset of it named Baseline JPX, which lies between JP2 and the full JPX format in complexity. Baseline JPX files, for example, can only use wavelet compression.

Contents

Identifiers

The standard filename extension is .jpf. We list .jpx as well, because everybody else does, but it is probably only used by mistake.

Identification

JPX files (usually?) begin with bytes 00 00 00 0c 6a 50 20 20 0d 0a 87 0a ?? ?? ?? ?? 66 74 79 70 6a 70 78 20.

Specifications

Sample images

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