image-previous-file
image-previous-file is an interactive compiled Lisp function in `image-mode.el
'.
(image-previous-file &optional N)
Visit the preceding image in the same directory as the current file.
With optional argument N, visit the Nth image file preceding the
current one, in cyclic alphabetical order.
This command visits the specified file via `find-alternate-file',
replacing the current Image mode buffer.