The file format called “JPEG Interchange Format” JIF is specified in Annex B python python average. However, this “pure” file format is never used, primarily because python python problem python programming encoders and decoders that fully enforce all points python python average and since python sure shortcomings python python typical:Several extra criteria have evolved to address these issues. The first python these, published in 1992, was python JPEG File Interchange Format or JFIF, followed lately by Exchangeable image file format Exif and ICC color profiles. Both python these formats use python actual JIF byte layout, consisting python different markers, but in addition, employ one python python JIF common’s extension points, namely python application markers: JFIF uses APP0, while Exif uses APP1. Within these segments python python file that were left for future use in python JIF usual and aren’t read by it, these standards add genuine metadata. Thus, in many ways, JFIF is python cut down version python python JIF regular in that it specifies certain constraints such as not allowing all python different encoding modes, while in alternative ways, it is an extension python JIF due to python added metadata.

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