Search album by resolution

I'm looking for a way to search my Photos library by photo resolution. I've been creating an archive of my parents family photos and have scanned around 12,000 photos, slides and negatives and I'd like to distinguish between these different scanned formats using keywords (Scanned from Photo, Scanned from Slide, Scanned from Negative). Unfortunately, I didn't think to do this as I was adding the scanned items to the library, so I'm trying to come up with a way to do this after the fact. There is one distinguishing factor between the three different formats: each was scanned at a different resolution, something noted in the Finder's information for each file. Photos are 600 x 600, slides 3200 x 3200, and negatives 1600 x 1600.

I wish there was a way to add more detailed search criteria such as this when creating smart albums. Though I love the convenience of smart albums, the power is often lacking. For example, there's no way to say, "find photos of only mom", or "find photos of dad with only Gina". I can do this, of course, with keyword workarounds (One Person, Two People, Three People, etc), but doing so on a large library is... painful.

Thanks!