This app requires a lot of images to be set to certain sizes. Here's a great free web app that you can use if you're not comfortable with Photoshop
Single Image Resizing: http://www.picresize.com
Batch Image Resizing: http://www.picresize.com/batch.php
Do you need 360 Images? We highly recommend Jamie with Visual Integrity http://www.visual-integrity-studios.com/. He has very resonable prices and a fast turn around time.