PHP programming - automatic image creation and comparison software

I would like to build an online service. That service will be used by PSD2HTML programmers to verify their work is correct. It gets the following parameters: [login to view URL] file (choose file...). [login to view URL] dimensions in drop down list (e.g. 1024*768 , 1366*768, 1920*1440 ,etc...) [login to view URL] to site (e.g. [login to view URL]) [login to view URL] and version (eg IE7 ,IE8 , FF5 ,Safari ,etc...) Once parameters are filled - [login to view URL] uploads the PSD. [login to view URL] takes a high-res screen capture of the browser window internal (e.g. without the address bar, frame, etc) [login to view URL] creates a high-res image from the PSD in the same format created on 2. [login to view URL] compares 2 and 3. [login to view URL] creates a new image of the diff between 2 and 3 as seen here ([login to view URL]). [login to view URL] downloads the image to the local PC. Preferably created in PHP over linux. Please - only East Europeans. Thanks, Dan