Clients have been uploading huuuge images, then complaining that the server is running out of memory.
Ofcourse one could bump the amount of memory, but this just introduces an arms race.
What hooks can I add to impose a maximum image size ( dimensions, not filesize ) on files uploaded, e.g. No you can't upload that 8 Megapixel shot, resize it first to < 2 Megapixels.
To be clear, I am talking about image size, not file size, aka Image height, and Image width