org-export-default-inline-image-rule

org-export-default-inline-image-rule is a variable defined in `ox.el'.
Its value is

(("file" . "\\.\\(gif\\|jp\\(?:e?g\\)\\|p\\(?:bm\\|gm\\|ng\\|pm\\)\\|tiff?\\|x\\(?:[bp]m\\)\\)\\'"))

• This variable may be risky if used as a file-local variable.

Documentation:
Default rule for link matching an inline image.
This rule applies to links with no description. By default, it
will be considered as an inline image if it targets a local file
whose extension is either "png", "jpeg", "jpg", "gif",
"tiff", "tif", "xbm", "xpm", "pbm", "pgm" or "ppm".
See `org-export-inline-image-p' for more information about
rules.