Is there a way display externally linked images at a consistent resolution?
===

I working on a site that displays images from a variety of other sites by having <img> elements that link directly to the other sites. Some of the images are high resolution and some of there are not. In the case that many high res images are being displayed the website performance goes down. Is there anyway to display the externally linked images at a consistent (reasonable) resolution so that less bandwidth is consumed and site performance does not falter?