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To display an image in an Emacs buffer, you must first create an image
descriptor, then use it as a display specifier in the display
property of text that is displayed (see Display Property). Like the
display property, this feature is available starting in Emacs 21.
Emacs can display a number of different image formats; some of them
are supported only if particular support libraries are installed on your
machine. The supported image formats include XBM, XPM (needing the
libraries libXpm version 3.4k and libz), GIF (needing
libungif 4.1.0), Postscript, PBM, JPEG (needing the
libjpeg library version v6a), TIFF (needing libtiff v3.4),
and PNG (needing libpng 1.0.2).
You specify one of these formats with an image type symbol. The image
type symbols are xbm, xpm, gif, postscript,
pbm, jpeg, tiff, and png.