iimage

Iimage is a minor mode that displays images, when image-filename
exists in the buffer.

** Display images in *Info* buffer.

(add-hook 'info-mode-hook 'iimage-mode)

.texinfo:   @file{file://foo.png}
.info:      `file://foo.png'

** Display images in Wiki buffer.

(add-hook 'wiki-mode-hook 'iimage-mode)

wiki-file:   [[foo.png]]