Currently, the "Image size" textfield allows for 10 characters, meaning you could go 10000x1000 or to some other absurd extremes. As I deem this highly unlikely, I'm going to reduce it to 7 characters, meaning you can go to either 999x999 or 99999x1 in the extremes.
Comments
Comment #1
Freso commentedCommitted to 7.x-1.x and 6.x-2.x.