Is there any way to find all untagged files in a folder in OS X?

Question

I have a folder that contains several thousand images which I'd like to add metadata to using Deep. Unfortunately, Deep doesn't look like I can filter my folder by which photos DO NOT have tags, so I'm looking for alternative ways of doing it.

Is there anyway to use Spotlight (or something similar) to give me a list of files that do not have any tags? Then I could use something like Tagit to do the manually tagging in smaller bunches, which would make Deep far more useful to me...

Answer 1

COMMAND+F in the Finder.
Choose "other" from the dropdown menu and choose the "Raw Query" option.
Then type the following:

kMDItemOMuserTags != '*'

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