Fast way to get image dimensions (not filesize)

Question

I\'m looking for a fast way to get the height and width of an image in pixels. It should handle at least JPG, PNG and TIFF, but the more the better. I emphasize

Answer 1

I not sure you have php installed, but this PHP function is pretty handy

 php -r "print_r(getimagesize('http://www.google.com/images/logos/ps_logo2.png'));"