Besides
information about the pixels
of the image, most cameras store additional information such as
the date and time the image was taken, aperture,
shutterspeed,
ISO,
and most other camera settings. These data, also known as
"metadata" are stored in a "header". A
common type of header is the EXIF
(Exchangeable Image File) header. EXIF is a standard for storing
information created by JEIDA (Japan
Electronic Industry Development Association) to encourage
interoperability between imaging devices. EXIF data are very
useful because you do not need to worry about remembering the
settings you used when taking the image. Later you can then
analyze on your computer which camera settings created the best
results, so you can learn from your experience.
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Example
of EXIF 2.2 information extracted with ACDSee
6.0.3 which allows the data preceded by the
"pencil" icon to be edited.
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Most
current image editing and viewing programs are able to display,
and even edit the EXIF data. Note that EXIF data may be lost when
saving a file after editing. It's one of the many reasons you
should always preserve your original image and use "Save
As" after editing it.
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