Image gallery with popups?

Hello,

I was just wondering if there was a modification or plugin for WordPress that would be a pretty ‘normal’ gallery with categories, thumbnails, etc. Only instead of showing the original pictures themselves on the WordPress page, it would open up a popup based on the size on the full size of the original image.

Every WordPress gallery I’ve tried so far takes the original picture (say 1024×768 or bigger) and condenses it into a tiny picture big enough to fit in the specified WordPress borders.

I just want something that will keep the original image original, no down-sizing, and that when you click on the thumbnail it will open the original full-size image in a popup window according to size.

Is there such a plugin?