I notice many files and templates I've seen have a Photoshop File in it. I'm sure its used to edit and used for the ending result of a website, but how do you break down the sections of the end picture? For example I've seen a header that shows a group of people but when it's used for the web, different parts of the picture is broken up into sections. I figured why not disect bigger sections of the PSD file rather than random sections of the whole pic? I may not make any sense but thats just assuming the PSD is used for editing. Please make this clear. Thanks to all.