A simple method that works in all programs is to add another layer, and create a line from the upper left to the lower right corners, and the same for upper right to lower left. You can then select all, scale selection, and line it up on these lines. This will crop to the same aspect ratio, with a different overall size.

Like this:


While hardly being an elegant solution, it has the advantage of working on any platform.

How to crop a square at the exact centre of an image in Photoshop?
I have seen players with a baby dragon as pet in Stendhal.



How do I get one?
