I often get asked how to How to Optimize and Save For the Web in photoshop, so I put together a little tutorial. I hope you find it helpful. Often times competition sites or publishers want a web size proof of your work and they have to meet certain size perimeters. For instance, they don't want your image to exceed 900px on the long side and the file size can not be larger than 300kb. This will help you stay with in those perimeters using Photoshop's save for the web command.