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JFIF is a graphical data format that enables the exchange of compressed JPEG files between computers. The main feature of the format is the use of a marker to indicate parameters that are not used in the JPEG standard, namely, pixel geometry, pixel size and some other parameters.

This format is used as the color palette format for a variety of operating system image editors. It is used to store font templates in text and graphic editors. It allows you to change color intensity and transparency levels.