I've realised that this is apparently the maximum image size photobucket allows you to put up for free nowadays. If someone can recommend me a better free image hosting site, I'll put this table up in full size so you can read it properly.
I usually use ImageShack. They do have limits on image size, but they are very generous limits --- it has to be under 5 megabytes in size for non-paying users. 5 megabytes is
big.