I'm thinking a block of wood would be best being you can't really put something between the hinge. But be careful not to bend the jamb with the wood. Take it SLOW and check progress often.
What I want to know from you is how the hell do you load such HUGE photos? I have tried to load photos no where near that big and it tells me they are too big and won't even let me do it. You REALLY need to make them smaller next time, I can't even get a good look at it because you have to scroll thru the photo it's so big.