Bitmap image stored in the SPIFF format, which was designed for interchanging image files between application environments; contains compressed image data split into header, directory, image data, and indirect data sections; used for storing image data on a hard drive, or for transmitting image data over a network.
SPIFF images support bitonal or continuous-tone (color or grayscale) images. They also support several different compression algorithms, including JBIG and JPEG.
NOTE: The SPIFF format was designed to replace the .JFIF format. It is still backwards compatible with JFIF.