How to list all images in uploads directory except those that are attached to any post

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I’ve got code in my functions.php which parses the WP uploads folder and lists all images it finds there. Is it possible to place a filter here that would exclude any image that is already “attached” to a post?

eg: “List all images in folder “uploads” where image is not found in (attached images)”

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  1. Under Media / Edit, there’s a means to list them, so I suggest you reuse the existing API.

    Else, a general method, which works anywhere, is to run a db query with a left join:

    select ID
  from foo
left join bar
    on whatever
 where condition
   and bar.ID is null;