u/DeadOneWalking

I'm not sure if anyone else knows this or not, but the save states are saved as a PNG image with additional information that's ignored when opening the image. It actually creates a screenshot that you can use however you want.

With the system off, pull the SD card, or connect the system to your computer, open the SD card on a computer, and then open the Memories folder. They are saved in individual folders.

I would recommend making a copy of the save state you want the image from so you don't mess anything up. Then you can save it and drop all the none-image data.