What is EXIF?

Besides information about the pixels of the image, most cameras store additional information such as the date and time the image was taken, aperture, shutter speed, 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 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.

Many digicam owners find EXIF data useful to study when comparing successful images to those which are not. The information is a great learning tool for those who want to understanding how camera settings effect digital photos.

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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.

An example of what standard EXIF info looks like: