Google Image Search – how to filter results by size

You can specify the exact dimension of the image that lets you filter results by size you need:

imagesize:WIDTHxHEIGHT

For example:

http://images.google.pl/images?um=1&hl=pl&lr=&q=imagesize%3A1680x1050++fish+wallpaper&btnG=Szukaj+obraz%C3%B3w