Hi folks,
How do I sort jpeg pictures by format?
i.e. I have 2000 pictures in a directory and I want them sorted
so that all pictures with landscape format (width > height) comes first
and then the pictures in portrait format (height > width).
I hope this sorting can be done by DirectoryOpus 
You can add the Height and Width columns and sort by them.
If the photos were taken with a digital camera which records orientation (i.e. they're automatically rotated to be the right way up) then you may find it useful to sort by the Rotation column instead.
Apart from that, though, there isn't an explicit Aspect Ratio column (width divided by height) at the moment but such a thing seems like a good idea so I've filed a feature request for you.