EXIF stands for Exchangeable Image File Format, and
is a standard for storing interchange information
in image files, especially those using JPEG compression.
Most digital cameras now use the Exif format. The format is part of the DCF standard
created by JEITA to encourage interoperability between imaging devices.
The metadata tags defined in the Exif including:
Date-time information. Digital cameras will record the current date and time and save this
in the image file. Related tags are: Picture taken, Digitized, Original
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
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