In Power Gallery 2 this is done by going to the Choose Design Tab. DUnder the Slideshow wide gallery, click the settings link. In the design editor, click the images link, and change the image dimensions.
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.