I do this with an action for my digital scrapbooking pages. I create pages that are 12" x 24" and then crop one side to 12x12, undo and crop the other side to 12x12. Each time I save the cropped version as a copy. Your image must be set up like didiermazier said - 16/10 ratio.
Using your crop tool, set it to 8x10, place it on the left side. Crop. Save a copy. Undo, repeat on right side. If you have a bunch, turn it into an action.
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