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Digital camera file formats

Most digital cameras record files in JPEG format (they have a .JPG filename extension), but they use a special variation of JPEG called Exif. This is a standard that allows extra information to be recorded by the camera into the image file. The Exif standard was developed by the Japanese Electronics Industry Development Association (JEIDA) and is used in almost all models of digital camera. The current version is 2.1.

The extra information in the file relates to picture-taking conditions, camera settings, color encoding information, sounds recorded when the picture was taken, and Global Positioning System (GPS) information. Exactly what is recorded depends on the model of camera.

If you select a digital camera file in Photo Explorer and use the File->Properties function you will see various information about the file. Digital camera files that have been directly transferred to the PC (without using TWAIN) will have an additional tab group called "Camera Information (Exif)". Here you can see information about the picture taking conditions such as the date the picture was taken, the shutter speed, aperture, and others. This information is contained in the JPG file and will be retained even if the photos are copied to CD or to other computers. But be careful, this information is often lost when pictures are saved from image editors and other software.







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