Nokia Picture Message

Nokia Picture Message (or Nokia Phone Picture Message, NPM) is a bi-level raster image format used by some Nokia phones. NPM images are 72×28 pixels, though the format supports other sizes up to 255×255.

Format
Files begin with a header of at least 11 bytes. The header size depends on the size of a variable-length "text message" field.

Identification
Files begin with the ASCII string " ".

Software

 * Netpbm: pbmtonokia, with " " option (write-only)

Sample files

 * KESSLER Wireless Design - Samples
 * https://telparia.com/fileFormatSamples/image/nokiaPictureMessage/