Difference between revisions of "JPEG"

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(JPEG metadata.)
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== Format ==
 
== Format ==
  
JPEG files consist of a well defined header, some [[metadata]], and a well defined footer. The header is usually <tt>FFd8</tt> (hex).
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JPEG files consist of a well defined [[header]], some [[metadata]], and a well defined [[footer]]. The header is usually <tt>FFd8</tt> (hex).
  
 
Common file extensions are .jpg, .jpeg, .JPG, .JPE, and .jfif.
 
Common file extensions are .jpg, .jpeg, .JPG, .JPE, and .jfif.
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== Metadata ==
 
== Metadata ==
  
JPEG files can contain lots of [[metadata]] in [[Exif]] format:
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JPEG files can contain lots of [[metadata]] in [[Exif]] format. The [[jhead]] command line tool can be used to extract that metadata.
 
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The [[jhead]] command line tool can be used to extract that metadata.
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== Externals Links ==
 
== Externals Links ==
  
 
* [http://en.wikipedia.org/wiki/JPEG Wikipedia: JPEG]
 
* [http://en.wikipedia.org/wiki/JPEG Wikipedia: JPEG]

Revision as of 06:01, 30 March 2006

The Joint Photographic Experts Group (JPEG) format is a commonly-used lossy image format.

Format

JPEG files consist of a well defined header, some metadata, and a well defined footer. The header is usually FFd8 (hex).

Common file extensions are .jpg, .jpeg, .JPG, .JPE, and .jfif.

Metadata

JPEG files can contain lots of metadata in Exif format. The jhead command line tool can be used to extract that metadata.

Externals Links