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Is a format developed by Sony for its proprietary Sony Reader devices. Files in this format may contain text and images. The format is XML-based.

G4 is a method to compress black and white images without losing quality. It is used for fax machines and as a one of the compression types for the TIFF format. G4 treats a picture as black dots and lines on a white page (less file size will be achieved if there are less black dots and lines).