I am currently trying to create desktop backrounds for various different screen sizes. My screen size is 1280x800.
I have just made a wallpaper for my screen resolution but I need to duplicate the same wallpaper so people with different screen sizes can use it. Is there a fast way of doing this without loosing image qaulity and so I don't have to design the same wallpaper several times? I hope you understand what I mean i'm not very good at explaining things.
maybe try Modify|Canvas|image and change width and constrain proportions. If proportions aren't correct then resize to width or height (closest to what you need) and crop to perfect size. Don't resize saved jpgs, use your original each time and save with new names. Start with largest size.