RE: how to not show images?

[Drew Adams]

    > Is there some way to _not_ show the images in a buffer or in
    all displayed
    > buffers - that is, not to remove them, but to simply not display them
    > (perhaps temporarily)?
    >
    > I'm looking for a user option (e.g. `show-images-flag') or a
    toggle command
    > (e.g. M-x toggle-image-display).

    What images are you talking about?

Uh, images displayed in an Emacs buffer?

For example, for speedbar, there is a user option, `speedbar-toggle-images',
that toggles display of (tree-node) images in the speedbar buffer.

I'm looking for a more generic user option that toggles display of all
images in an Emacs session, or at least in a given Emacs buffer.