Exif - Revision history

Nathan Yergler: Redirecting to XMP

2008-03-04T16:44:40Z

Redirecting to XMP

← Older revision		Revision as of 16:44, 4 March 2008
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	[[~~Category:Developer]]~~		#REDIRECT [[XMP]]
	~~[[Category:Developer Challenges]]~~
	~~[[Category:Example]]~~
	~~[[Category:Metadata]]~~
	~~[[Category:Exif]]~~
	~~{{Filetype\|~~
	~~license_url=False\|~~
	~~web_statement=False\|~~
	~~more_permissions=False~~
	}}
	~~== Recommendation ==~~


	~~The standard Exif metadata tag "Copyright", which is a string. It should contain a URL with a copyright notice for the embedded file.~~

	~~0x8298 Copyright string IFD0~~

	This use is equivalent to the recommend use of the xapRights:WebStatement field supported by [[XMP]]. Note that XMP may be embedded into EXIF (and many other formats) but is a separate standard not as widely supported.

	~~=== Example ===~~

	~~http://static.flickr.com/77/216141670_fd6d6ae37a_s.jpg~~

	~~If this photo included EXIF metadata compliant with this recommendation, it would contain~~

	~~http://www.flickr.com/photos/miak/216141670/~~

	~~in its Copyright field as that URL contains copyright notice for the image.~~

	~~== About Exif ==~~

	[http://en.wikipedia.org/wiki/Exif Exchangeable image file format] (official abbreviation Exif, not EXIF) is a specification for the image file metadata format used in audio and image files. However, it is not commonly used in audio and is primarily used by digital cameras to store information such as shutter speed, f-stop, zoom, and so forth. It was created by the Japan Electronic Industry Development Association (JEIDA). The specification uses the existing JPEG, TIFF Rev. 6.0, and RIFF WAVE file formats, with the addition of specific metadata tags. It is not supported in JPEG 2000 or PNG.

	Because the Exif 2.1 standard was created in 1998, it is supported by most image viewing or editing software, as well as nearly all digital cameras. Exif data is available in over 30 file formats; consequently, Exif data is a valuable tool for Creative Commons, as it has greater support than certain other recent metadata formats: XMP~~, for instance.~~

	~~== Exif Structure ==~~

	~~Exif data is structured into discrete tags. Each piece of information included in an image has a Tag Name, Field Name, Tag ID, Type, and Count.~~

	~~''Tag Name'' is an informal description of each tag.~~

	~~''Field Name'' is a variable name describing the tag, and used by some programs~~

	~~''Tag ID'' is either a hex or decimal number frequently used to reference a tag~~

	~~''Type'' can be Byte, ASCII, Short, Long, Rational, Undefined, SLong or SRational, usually abbreviated as a number~~

	~~''Count'' is the number of values, but not the number of bytes. One Short has a count of 1, despite being 2 bytes~~

	~~An example of one tag is Image width, whose Field Name is ImageWidth, ID of 0x0100, type of either short or long, and a count of 1.~~

	Of more interest to Creative Commoners is the tag whose Field Name is "Artist", ID 0x013B, type ASCII, and of undetermined length. There are tags for artist, title, copyright, and comments, all of interest to Creative Commons.

	~~Tags are also separated into groups such as Header, IFD0, IFD1, Exif IFD, GPS IFD, or Thumbnail Image Data. Artist, title and copyright information are all in IFD0. Comments are in the Exif IFD.~~

	More information is available in the [http://exif.org/specifications.html Official Exif Specifications] and Exif basic tag types are listed at http://www.sno.phy.queensu.ca/~phil/exiftool/TagNames/EXIF.html

	~~== Developer Challenges ==~~

	~~Develop software that embeds and can edit licenses and metadata into this file format per the recommendation above.~~


	~~=== Implementations ===~~

	~~There are libraries which manipulate Exif data in most languages - notably [http://www.exiv2.org/ exiv2 (C++)], [http://owl.phy.queensu.ca/~phil/exiftool/ ExifTool (Perl)~~] ~~and [http://pel.sourceforge.net/ PEL (PHP)~~]~~. All of these libraries support reading and writing EXIF information.~~

	~~=== Examples ===~~

	~~=== Code ===~~

	* Please add yours here :)

	~~==== Sample ====~~

	* Please add yours here :)

	~~=== Mockups ===~~

	* Please add yours here :)

	~~=== TODO ===~~

	* Please help by adding you todo here :)

	~~=== Reference ===~~

	* http://en.wikipedia.org/wiki/Exif
	* http://exif.org/specifications.html

Nathan Yergler at 18:04, 10 October 2007

2007-10-10T18:04:33Z

← Older revision		Revision as of 18:04, 10 October 2007
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	[[Category:Developer]]		[[Category:Developer]]
	[[Category:Developer Challenges]]		[[Category:Developer Challenges]]
	~~[[Category:Filetype]]~~
	[[Category:Example]]		[[Category:Example]]
	[[Category:Metadata]]		[[Category:Metadata]]
	[[Category:Exif]]		[[Category:Exif]]
			{{Filetype\|
			license_url=False\|
			web_statement=False\|
			more_permissions=False
			}}
	== Recommendation ==		== Recommendation ==

Boardhead: /* Implementations */

2007-01-04T15:59:19Z

Implementations

← Older revision		Revision as of 15:59, 4 January 2007
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	=== Implementations ===		=== Implementations ===

	There are libraries which manipulate Exif data in most languages - notably [http://pel.sourceforge.net/ PHP]. ~~Some languages only have~~ libraries ~~for~~ reading ~~Exif data,~~ and ~~none to write it~~.		There are libraries which manipulate Exif data in most languages - notably [http://www.exiv2.org/ exiv2 (C++)], [http://owl.phy.queensu.ca/~phil/exiftool/ ExifTool (Perl)] and [http://pel.sourceforge.net/ PEL (PHP)]. All of these libraries support reading and writing EXIF information.

	=== Examples ===		=== Examples ===

Mike Linksvayer: /* About EXIF */

2006-08-19T00:16:39Z

About EXIF

← Older revision		Revision as of 00:16, 19 August 2006
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	in its Copyright field as that URL contains copyright notice for the image.		in its Copyright field as that URL contains copyright notice for the image.

	== About ~~EXIF~~ ==		== About Exif ==

	[http://en.wikipedia.org/wiki/Exif Exchangeable image file format] (official abbreviation Exif, not EXIF) is a specification for the image file metadata format used in audio and image files. However, it is not commonly used in audio and is primarily used by digital cameras to store information such as shutter speed, f-stop, zoom, and so forth. It was created by the Japan Electronic Industry Development Association (JEIDA). The specification uses the existing JPEG, TIFF Rev. 6.0, and RIFF WAVE file formats, with the addition of specific metadata tags. It is not supported in JPEG 2000 or PNG.		[http://en.wikipedia.org/wiki/Exif Exchangeable image file format] (official abbreviation Exif, not EXIF) is a specification for the image file metadata format used in audio and image files. However, it is not commonly used in audio and is primarily used by digital cameras to store information such as shutter speed, f-stop, zoom, and so forth. It was created by the Japan Electronic Industry Development Association (JEIDA). The specification uses the existing JPEG, TIFF Rev. 6.0, and RIFF WAVE file formats, with the addition of specific metadata tags. It is not supported in JPEG 2000 or PNG.

Mike Linksvayer at 00:15, 19 August 2006

2006-08-19T00:15:40Z

← Older revision		Revision as of 00:15, 19 August 2006
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	[[Category:Developer]]		[[Category:Developer]]
	[[Category:Developer Challenges]]		[[Category:Developer Challenges]]
	[[Category:~~filetype~~]]		[[Category:Filetype]]
	[[Category:~~example~~]]		[[Category:Example]]
	[[Category:~~metadata~~]]		[[Category:Metadata]]
	[[Category:Exif]]		[[Category:Exif]]
	~~{{incomplete}}~~

	== Recommendation ==		== Recommendation ==

Mike Linksvayer: /* Example */

2006-08-19T00:12:35Z

Example

← Older revision		Revision as of 00:12, 19 August 2006
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	http://www.flickr.com/photos/miak/216141670/		http://www.flickr.com/photos/miak/216141670/

	in its Copyright field.		in its Copyright field as that URL contains copyright notice for the image.

	== About EXIF ==		== About EXIF ==

Mike Linksvayer: /* Recommendation */

2006-08-19T00:10:09Z

Recommendation

← Older revision		Revision as of 00:10, 19 August 2006
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	This use is equivalent to the recommend use of the xapRights:WebStatement field supported by [[XMP]]. Note that XMP may be embedded into EXIF (and many other formats) but is a separate standard not as widely supported.		This use is equivalent to the recommend use of the xapRights:WebStatement field supported by [[XMP]]. Note that XMP may be embedded into EXIF (and many other formats) but is a separate standard not as widely supported.

			=== Example ===

			http://static.flickr.com/77/216141670_fd6d6ae37a_s.jpg

			If this photo included EXIF metadata compliant with this recommendation, it would contain

			http://www.flickr.com/photos/miak/216141670/

			in its Copyright field.

	== About EXIF ==		== About EXIF ==

Mike Linksvayer at 23:58, 18 August 2006

2006-08-18T23:58:02Z

← Older revision		Revision as of 23:58, 18 August 2006
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	[[Category:Exif]]		[[Category:Exif]]
	{{incomplete}}		{{incomplete}}

			== Recommendation ==


			The standard Exif metadata tag "Copyright", which is a string. It should contain a URL with a copyright notice for the embedded file.

			0x8298 Copyright string IFD0

			This use is equivalent to the recommend use of the xapRights:WebStatement field supported by [[XMP]]. Note that XMP may be embedded into EXIF (and many other formats) but is a separate standard not as widely supported.

			== About EXIF ==

	[http://en.wikipedia.org/wiki/Exif Exchangeable image file format] (official abbreviation Exif, not EXIF) is a specification for the image file metadata format used in audio and image files. However, it is not commonly used in audio and is primarily used by digital cameras to store information such as shutter speed, f-stop, zoom, and so forth. It was created by the Japan Electronic Industry Development Association (JEIDA). The specification uses the existing JPEG, TIFF Rev. 6.0, and RIFF WAVE file formats, with the addition of specific metadata tags. It is not supported in JPEG 2000 or PNG.		[http://en.wikipedia.org/wiki/Exif Exchangeable image file format] (official abbreviation Exif, not EXIF) is a specification for the image file metadata format used in audio and image files. However, it is not commonly used in audio and is primarily used by digital cameras to store information such as shutter speed, f-stop, zoom, and so forth. It was created by the Japan Electronic Industry Development Association (JEIDA). The specification uses the existing JPEG, TIFF Rev. 6.0, and RIFF WAVE file formats, with the addition of specific metadata tags. It is not supported in JPEG 2000 or PNG.
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	Tags are also separated into groups such as Header, IFD0, IFD1, Exif IFD, GPS IFD, or Thumbnail Image Data. Artist, title and copyright information are all in IFD0. Comments are in the Exif IFD.		Tags are also separated into groups such as Header, IFD0, IFD1, Exif IFD, GPS IFD, or Thumbnail Image Data. Artist, title and copyright information are all in IFD0. Comments are in the Exif IFD.

	More information is available in the [http://exif.org/specifications.html Official Exif Specifications]		More information is available in the [http://exif.org/specifications.html Official Exif Specifications] and Exif basic tag types are listed at http://www.sno.phy.queensu.ca/~phil/exiftool/TagNames/EXIF.html

	== Developer Challenges ==		== Developer Challenges ==

	Develop software that embeds and can edit licenses and metadata into this file format.		Develop software that embeds and can edit licenses and metadata into this file format per the recommendation above.

	~~The standard Exif metadata tag "Copyright", which is a string. It should contain a URL with a copyright notice for~~ the ~~embedded file.~~

	~~0x8298 Copyright string IFD0~~


	~~Exif basic tag types are available here: http://www.sno.phy.queensu.ca/~phil/exiftool/TagNames/EXIF~~.~~html~~

Mike Linksvayer at 23:53, 18 August 2006

2006-08-18T23:53:39Z

← Older revision		Revision as of 23:53, 18 August 2006
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	== Developer Challenges ==		== Developer Challenges ==

	Develop software that embeds and can edit licenses and metadata into this file format..		Develop software that embeds and can edit licenses and metadata into this file format.

	~~Also, one should support the~~ standard Exif metadata tag "Copyright", which is a string ~~would be important as well:~~		The standard Exif metadata tag "Copyright", which is a string. It should contain a URL with a copyright notice for the embedded file.

	0x8298 Copyright string IFD0		0x8298 Copyright string IFD0

	~~And the Comment type as well:~~

	~~0x9286 UserComment undef ExifIFD~~

	Exif basic tag types are available here: http://www.sno.phy.queensu.ca/~phil/exiftool/TagNames/EXIF.html		Exif basic tag types are available here: http://www.sno.phy.queensu.ca/~phil/exiftool/TagNames/EXIF.html

Mike Linksvayer: /* Developer Challenges */ xmp properties may not be used in exif (apart from those that mirror exif fields!), removing irrelevant comment

2006-08-18T22:56:50Z

Developer Challenges: xmp properties may not be used in exif (apart from those that mirror exif fields!), removing irrelevant comment

← Older revision		Revision as of 22:56, 18 August 2006
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	== Developer Challenges ==		== Developer Challenges ==

	Develop software that embeds and can edit licenses and metadata into this file format. The tag types to use for this are the [http://www.sno.phy.queensu.ca/~phil/exiftool/TagNames/XMP.html#dc XMP dc type] and the [http://www.sno.phy.queensu.ca/~phil/exiftool/TagNames/XMP.html#cc XMP cc tag type].		Develop software that embeds and can edit licenses and metadata into this file format..

	Also, one should support the standard Exif metadata tag "Copyright", which is a string would be important as well:		Also, one should support the standard Exif metadata tag "Copyright", which is a string would be important as well: