Categorize based on aspect ratio

[Sloop0]

I scan all my business cards, and am finding that it'd be very useful to have the ability to set document type/tags based on the document's aspect ratio. For example, if it were possible to create a document type for 'business card' that would automatically be set if the file's aspect ratio were between 1.7 and 1.8, that would catch all business cards, and as far as I can tell wouldn't catch anything else.