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.
This bitmap image format was created for storing images taken in HDR mode, which provides a high dynamic contrast ratio. It may have either a 32- or 16-bit pixel structure. It is used for high-quality graphics with rich bitmap images, with or without lossy compression.