That is correct. Upload the full sized image and store the location in your database. Then use image resizer on any page you want the image displayed, like the gallery page.
Your friends over here at WebAssist! These Dreamweaver extensions will assist you in building unlimited, custom websites.
These out-of-the-box solutions provide you proven, tested applications that can be up and running now. Build a store, a gallery, or a web-based email solution.