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Version 2.1 of the specification is dated June 12 , 1998 and version 2.2 is dated April 2002 .

The metadata tags defined in the Exif standard cover a broad spectrum including:
  • Date and time information. Digital cameras will record the current date and time and save this in the metadata.

  • Camera settings. This includes static information such as the camera model and make, and information that varies with each image such as orientation, Aperture , Shutter Speed , Focal Length , Metering Mode , and Film Speed information.

  • Location information, which could come from a GPS receiver connected to the camera. As Of 2004 only a few cameras support this, though. Some people therefore use a normal receiver to track their movements, and then post-process the images by matching the timestamps in the images with the log from the receiver and can so add the missing information to images.

  • Descriptions and copyright information. Again this is something which is most often done when post-processing the images, as only high-end camera models let the user choose a text for these fields.



PROGRAM SUPPORT


Exif data is embedded within the image file itself. While many recent Image Manipulation Programs recognize Exif data and will maintain it when writing to a modified image, this is not the case for most older programs.


CAPITALIZATION


While Exif is an acronym, and would normally be uppercased, the official specification defines it as "Exif".


STATUS


The Exif specification is currently unmaintained because there is no public entity or people officially behind Exif.


VIEWING EXIF

In Windows XP, a subset of the Exif information may be viewed by right clicking on an Image File and clicking properties; from the properties dialog click the Summary tab. However, this may damage the Exif header.

On Mac OS X 10.4 and above, this information may be viewed in the Finder by doing Get Info on a file and expanding the More Info section.

On Linux, a subset of Exif data can be seen by right clicking the file and selecting properties. Most Linux image viewers would give the full set of Exif data.

There are many software tools available which allow both viewing and editing of Exif data.


EXAMPLE


The following table shows Exif data for a photo made with a typical digital camera. Notice that authorship and copyright information is not provided in the camera's output, so it must be filled in during later stages of processing.


SEE ALSO



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References