[corysama]

I’ve done some work on implementing this as a coder, not a mathematician. So, the following description is just how the process looks while you are implementing it :P

Take the original curved image and put it on a super stretchy rubber sheet. Pull all four corners out diagonally until the curves look straight. You have to pull really hard and the corners will be stretched out into thin spikes.

But, no one wants to see an image that’s 80% long, thin spikes with lots of empty space between them. So, go to the center and crop down to the biggest rectangle you can that doesn’t have empty space around the edges.