image viewers

Has anyone got feh 1.3.4 or gimv 0.2.27 to read from stdin? Failing
that, can you recommend an image viewer that does? xv did it back in
the day, but I don't know that it's portable enough.

The closest I've gotten is

feh /proc/self/fd/0 < $FILE
or
gimv -e /proc/self/fd/0 < $FILE

but what I really want is

.... | feh $OPTIONS

or similar. I tried

.... > $PIPE & feh $PIPE

and

.... > $PIPE & feh /proc/self/fd/0 < $PIPE

but those failed with the usual errors:

[2] 19770
feh - No loadable images specified.
Use feh --help for detailed usage information

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