Exif

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The Exif specification defines limited subsets of [[TIFF]], [[JPEG]], and [[WAV]] formats, and adds a standard way to store metadata in such files. Although it may be technically inaccurate, it's natural to think of Exif as the metadata format that is embedded in such files (instead of the files as a whole). And in practice, Exif metadata is sometimes used in files that do not conform to the specification, or in file formats that are not in the specification.
 
The Exif specification defines limited subsets of [[TIFF]], [[JPEG]], and [[WAV]] formats, and adds a standard way to store metadata in such files. Although it may be technically inaccurate, it's natural to think of Exif as the metadata format that is embedded in such files (instead of the files as a whole). And in practice, Exif metadata is sometimes used in files that do not conform to the specification, or in file formats that are not in the specification.
  
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== Embedding ==
+
== Related formats ==
  
−
For [[TIFF]] format, Exif defines a number of new TIFF tags, which are integrated into the TIFF file in IFDs that are pointed to by TIFF tags 34665, 34853, and 40965.
+
* For [[TIFF]] format, Exif defines a number of new TIFF tags, which are integrated into the TIFF file in IFDs that are pointed to by TIFF tags 34665, 34853, and 40965.
  
−
In [[JPEG]] (and other image?) files, Exif data is stored in what amounts to an embedded TIFF file. The data is structurally valid TIFF data, though it would not make a fully valid TIFF file because it does not have a primary image. An APP1 marker with the identifier "Exif" is used for Exif data.
+
* In [[JPEG]] (and other image?) files, Exif data is stored in what amounts to an embedded TIFF file. The data is structurally valid TIFF data, though it would not make a fully valid TIFF file because it does not have a primary image. An APP1 marker with the identifier "Exif" is used for Exif data.
  
−
The Exif specification also defines a way to store [[FlashPix]] data in Exif-conformant JPEG files. APP2 markers with the identifier "FPXR" are used. This uses a completely different data format, unrelated to TIFF.
+
* For some reason, the Exif specification defines a way to store [[FlashPix]] data in Exif-conformant JPEG files. APP2 markers with the identifier "FPXR" are used. This uses a completely different data format, unrelated to TIFF. Some FPXR segments contain an [[OLE Property Set]]. Others may contain [[WAVE]] Audio.
 +
 
 +
* [[WAV]]
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* [[DCF]]
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* [[MakerNote]]
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* Many [[Cameras and Digital Image Sensors|raw camera formats]] include Exif metadata.
  
 
== Identifiers ==
 
== Identifiers ==
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! LoCFDD
 
! LoCFDD
 
|-
 
|-
−
|Exif 2.2 ||  || {{LoCFDD|fdd000146}}
+
|Exif 2.0 JPEG || {{PRONOM|x-fmt/398}}
 
|-
 
|-
−
|Exif 2.2 JPEG || {{PRONOM|x-fmt/391}} ||  {{LoCFDD|fdd000147}}
+
|Exif 2.0 TIFF || {{PRONOM|x-fmt/399}}
 
|-
 
|-
−
|Exif 2.2 TIFF || {{PRONOM|x-fmt/387}} ||  {{LoCFDD|fdd000145}}
+
|Exif 2.0 WAVE || {{PRONOM|x-fmt/397}}
−
|-
+
−
|Exif 2.2 WAVE || {{PRONOM|x-fmt/396}}
+
 
|-
 
|-
 
|Exif 2.1 JPEG || {{PRONOM|x-fmt/390}}
 
|Exif 2.1 JPEG || {{PRONOM|x-fmt/390}}
Line 37: Line 40:
 
|Exif 2.1 WAVE || {{PRONOM|x-fmt/389}}
 
|Exif 2.1 WAVE || {{PRONOM|x-fmt/389}}
 
|-
 
|-
−
|Exif 2.0 JPEG || {{PRONOM|x-fmt/398}}
+
|Exif 2.2 ||  || {{LoCFDD|fdd000146}}
 
|-
 
|-
−
|Exif 2.0 TIFF || {{PRONOM|x-fmt/399}}
+
|Exif 2.2 JPEG || {{PRONOM|x-fmt/391}} ||  {{LoCFDD|fdd000147}}
 
|-
 
|-
−
|Exif 2.0 WAVE || {{PRONOM|x-fmt/397}}
+
|Exif 2.2 TIFF || {{PRONOM|x-fmt/387}} ||  {{LoCFDD|fdd000145}}
 +
|-
 +
|Exif 2.2 WAVE || {{PRONOM|x-fmt/396}}
 +
|-
 +
|Exif 2.2.1 JPEG || {{PRONOM|fmt/645}}
 
|}
 
|}
−
 
−
== See also ==
 
−
* [[Exif MakerNote]]
 
  
 
== Specifications ==
 
== Specifications ==
 +
The Exif standard is freely available, but some parts of it rely on documents that are not, such as ISO 12232 and ISO 14524. See the References section of the Exif standard.
 
* [http://www.exif.org/Exif2-1.PDF Exif version 2.1]
 
* [http://www.exif.org/Exif2-1.PDF Exif version 2.1]
 
* [http://www.exif.org/Exif2-2.PDF Exif version 2.2]
 
* [http://www.exif.org/Exif2-2.PDF Exif version 2.2]
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* [http://www.cipa.jp/english/hyoujunka/kikaku/pdf/DC-008-2010_E.pdf Exif version 2.3]
+
* [http://www.cipa.jp/std/documents/e/DC-008-2010_E.pdf Exif version 2.3; 2010-04; Translation-2010]
 +
* [http://www.cipa.jp/std/documents/e/DC-008-2012_E.pdf Exif version 2.3; 2010-04; Revised 2012-12, Translation-2012]
 +
* [http://www.cipa.jp/std/documents/e/DC-008-Translation-2016-E.pdf Exif version 2.31; 2010-04; Revised 2016-07, Translation-2016]
 +
* [https://www.cipa.jp/std/documents/download_e.html?DC-010-2020_E Exif version 2.32]
 +
* [https://www.cipa.jp/std/documents/download_e.html?DC-008-Translation-2023-E Exif version 3.0]
  
 
== External links ==
 
== External links ==
 
* [[Wikipedia:Exchangeable image file format|Wikipedia article]]
 
* [[Wikipedia:Exchangeable image file format|Wikipedia article]]
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* [http://www.sno.phy.queensu.ca/~phil/exiftool/TagNames/EXIF.html Exiftool EXIF Tags]
+
* [https://exiftool.org/TagNames/EXIF.html Exiftool EXIF Tags]
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* [[Konvertor]]
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* [http://www.logipole.com Metadata++ supports EXIF, IPTC, XMP]
  
−
[[Category:TIFF]]
 
 
[[Category:Graphics]]
 
[[Category:Graphics]]
 +
[[Category:Cameras and Digital Image Sensors]]
 
[[Category:Audio and Music]]
 
[[Category:Audio and Music]]
 +
[[Category:TIFF]]
 +
[[Category:JPEG]]

Latest revision as of 13:09, 23 September 2023

File Format
Name Exif
Ontology
LoCFDD fdd000146, fdd000147, fdd000145
PRONOM x-fmt/391, x-fmt/387, others

Exchangeable image file format (Exif) is a standard for storing metadata in image and audio files.

The Exif specification defines limited subsets of TIFF, JPEG, and WAV formats, and adds a standard way to store metadata in such files. Although it may be technically inaccurate, it's natural to think of Exif as the metadata format that is embedded in such files (instead of the files as a whole). And in practice, Exif metadata is sometimes used in files that do not conform to the specification, or in file formats that are not in the specification.

Contents

[edit] Related formats

  • For TIFF format, Exif defines a number of new TIFF tags, which are integrated into the TIFF file in IFDs that are pointed to by TIFF tags 34665, 34853, and 40965.
  • In JPEG (and other image?) files, Exif data is stored in what amounts to an embedded TIFF file. The data is structurally valid TIFF data, though it would not make a fully valid TIFF file because it does not have a primary image. An APP1 marker with the identifier "Exif" is used for Exif data.
  • For some reason, the Exif specification defines a way to store FlashPix data in Exif-conformant JPEG files. APP2 markers with the identifier "FPXR" are used. This uses a completely different data format, unrelated to TIFF. Some FPXR segments contain an OLE Property Set. Others may contain WAVE Audio.

[edit] Identifiers

Format PRONOM LoCFDD
Exif 2.0 JPEG x-fmt/398
Exif 2.0 TIFF x-fmt/399
Exif 2.0 WAVE x-fmt/397
Exif 2.1 JPEG x-fmt/390
Exif 2.1 TIFF x-fmt/388
Exif 2.1 WAVE x-fmt/389
Exif 2.2 fdd000146
Exif 2.2 JPEG x-fmt/391 fdd000147
Exif 2.2 TIFF x-fmt/387 fdd000145
Exif 2.2 WAVE x-fmt/396
Exif 2.2.1 JPEG fmt/645

[edit] Specifications

The Exif standard is freely available, but some parts of it rely on documents that are not, such as ISO 12232 and ISO 14524. See the References section of the Exif standard.

[edit] External links

Retrieved from "http://fileformats.archiveteam.org/index.php?title=Exif&oldid=45495"
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