Here is a script that is published on the 4guysfromrolla site by Mike Shaffer: His article can be found at www.4guysfromrolla.com/webtech/050300-1.shtml
The Script checks for graphic files and then reports back the height, width
and size and color settings.
We have modified it just slightly so that if you need these properties and you
don't know what the full path to the files are, you can use the server.mappath
function to get at them.
The modifications we made are marked by this symbol '-----
View the scriptI was especially keen on this script because I want to allow uploading of image files on one of my sites and since I wouldn't know in advance what the height & width would be it was important to find out at least the height so that I could reduce the image size but keep the aspect ratio.