GNU Emacs Lisp Reference Manual
38.13.4 GIF Images
For GIF images, specify image type
gif. Because of the patents
in the US covering the LZW algorithm, the continued use of GIF format is
a problem for the whole Internet; to end this problem, it is a good idea
for everyone, even outside the US, to stop using GIFS right away
(http://www.burnallgifs.org/). But if you still want to use
them, Emacs can display them.
- You can use
:index to specify one image from a GIF file that
contains more than one image. This property specifies use of image
number index from the file. An error is signaled if the GIF file
doesn't contain an image with index index.