The Free On-line Dictionary of Computing (30 December 2018):

image formats

    There are many formats used to store
   images in files.  GIF, TIFF and JPEG are very common.
   Others are BIFF, bmp, Clear, FITS, IFF, NFF,
   OFF, PCX, PNG, TGA, XBM.

   Some of these are documented on-line at the following sites:

   The Graphics File Format Page
   (http://dcs.ed.ac.uk/~mxr/gfx/).
   The NCSA file formats archive
   (ftp://ftp.ncsa.uiuc.edu/misc/file.formats/graphics.formats).
   The Avalon repository
   (ftp://avalon.viewpoint.com/pub/format_specs).

   [Others?]

   (1997-08-07)