Eli Zaretskii <eliz@gnu.org> writes:

>> It doesn't really matter what image type you use as long as the image is
>> narrower than the width you're :align-to-ing.
>
> Humor me?  Please?

(progn
  (insert-image (create-image "~/rms.jpg") " ")
  (insert (propertize " " 'display
                          `(space :align-to (200))
                          'intangible t))
  (insert-image (create-image "~/rms.jpg") " "))