JPX

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* Fragmented codestreams (even across multiple files)
 
* Fragmented codestreams (even across multiple files)
 
* The possibility to combine multiple codestreams as composites or animations
 
* The possibility to combine multiple codestreams as composites or animations
* The possibility to use compression methods other than [[JPEG 2000 codestream]] ([[wavelet compression]]): uncompresssed, [[Modified Huffman]], [[Modified READ]], [[Modified Modified READ]], [[JBIG]], [[JPEG]], [[JPEG-LS]], [[JBIG2]]
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* The possibility to use compression methods other than [[JPEG 2000 codestream]] ([[wavelet compression]]): uncompressed, [[Modified Huffman]], [[Modified READ]], [[Modified Modified READ]], [[JBIG]], [[JPEG]], [[JPEG-LS]], [[JBIG2]]
  
 
The JPX specification is apparently 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.
 
The JPX specification is apparently 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.

Revision as of 14:54, 10 August 2013

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 JPEG 2000 standard (ISO/IEC 15444-2).

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

The JPX specification is apparently 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 current version of the standard clearly states that the official filename extension is .jpf, and doesn't even mention .jpx as a possibility. However, some reputable sources say that .jpx is legitimate, or even preferred.

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

Links

Editors' notes

There must be a story behind why the JPX filename extension is .jpf instead of .jpx, but we have not been able to locate it. Perhaps it was originally intended to be .jpx, but was changed due to a conflict. The next most common use of .jpx seems to be for JBuilder project files.

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