Difference between revisions of "JPEG"

From Forensics Wiki
Jump to: navigation, search
(Metadata)
m
Line 1: Line 1:
 
The '''Joint Photographic Experts Group''' ('''JPEG''') format is a commonly-used lossy [[image format]].
 
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 <tt>FF D8</tt> (hex).
+
 
 +
= Format =
 +
 
 +
JPEG is a container file format that consist of a well defined [[header]], some [[metadata]],icons,  a color table, compressed data, and a well defined [[footer]]. The header is usually <tt>FF D8</tt> (hex).
  
 
Common file extensions are .jpg, .jpeg, .JPG, .JPE, and .jfif.
 
Common file extensions are .jpg, .jpeg, .JPG, .JPE, and .jfif.
  
== Metadata ==
+
= Metadata =
  
 
JPEG files can contain lots of [[metadata]] in several formats: [[Exif]], [[IPTC]], GPS, [[Camera Raw]] etc.
 
JPEG files can contain lots of [[metadata]] in several formats: [[Exif]], [[IPTC]], GPS, [[Camera Raw]] etc.
The [[jhead]] command line tool, for example, can be used to extract and manipulate some of that metadata.
+
The [[exif]] and [[jhead]] command tools  can extract and manipulate some of that metadata.
  
== Externals Links ==
+
= Externals Links =
  
 
* [http://en.wikipedia.org/wiki/JPEG Wikipedia: JPEG]
 
* [http://en.wikipedia.org/wiki/JPEG Wikipedia: JPEG]

Revision as of 16:56, 12 July 2008

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


Format

JPEG is a container file format that consist of a well defined header, some metadata,icons, a color table, compressed data, and a well defined footer. The header is usually FF D8 (hex).

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

Metadata

JPEG files can contain lots of metadata in several formats: Exif, IPTC, GPS, Camera Raw etc. The exif and jhead command tools can extract and manipulate some of that metadata.

Externals Links