photo width and height

When I store a photo link I get the width and height using loadgraphic.
I store it because loadgraphis is slow.
I use the width and height in order to show photos in a table. To make sure the tall thing photos, and the short fat photos take the same space in a cell I divide the (height * .75) by the width. I use the percentage as the width of the cell.
The only problem is that they could change the photo size after I store it.

So my question; Is there a faster way to get the width and height of a photo so I can get width and height dynamically instead of storing it up front.

Thanks for the help...

I've used ImageMagick (http://imagemagick.org/) to manipulate images from Run Basic (using shell$()). It has tools to give you the size of an image. Not sure if running an external program would be quicker than using loadgraphic, but it might be worth trying.