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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.

PNG is a raster graphic data storage format that uses lossless compression algorithm to Deflate. PNG was created as a free format to replace GIF. PNG supports three main types of raster images: grayscale image, a color indexed image and the color image. PNG format stores graphical information in a compressed form.