Preview holds up ejecting an external disk

Reporting a problem/work around
I have most of my files on an external hard drive.  When I open a file in Preview (this usually happens with image files), then quit preview, the hard drive cannot be ejected because the disk is still in use.  It is possible that iCloud or some other service keeps Preview from terminating.  The workaround I've found is:
1.  Open up a terminal
2.  Type:     lsof | grep /Volumes/MyHardDrive
3.  This returns a statement that contains a number, Preview, the file that Preview opened when Preview was running.  Note this number #
4.  Type:    kill -9  #
5.  Wait a second, then eject your hard drive as usual.
There should be a better way.  Does anyone know a better way to quit Preview other than command-Q?

See: About contacts, schedules, and notes on your iPod.
How do i do this?
See above.
If I do this will I still be able to play music on it?
Yes.
How much trouble will this cause the next time I sync with I tunes?
None whatsoever.

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