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This is a format that applies an 8-bit encoding to images for the purpose of compression and transportation. The format was originally developed for the Utah Raster Toolkit software package for managing bitmaps. The compression algorithm provides a replacement for repeating strings of bytes into pairs, which significantly reduces the file size.

This format was created by Nokia for use in its proprietary phones. A bitmap image was used to transfer image files between devices over a wireless connection. It was mainly used when exchanging multimedia text messages that support inserting pictures.