Poser Bump Map

A Poser Bump Map (BUM) is a file used by a program called Poser for storing bump maps, which are a variety of bitmaps that represent the texture of a rough 3-D surface. BUM files are actually in the same format as Windows BMP files, and can be opened in most graphic programs if the extension is renamed to .bmp.

Links

 * Mastering Bump Maps for Poser and Bryce
 * Bump Maps and File Formats
 * Converting BUM files to jpg (forum discussion)