ElectricTriangle said:

At least on my end, your links for Star Wars and Jedi are 1024x685 rather than the 1730x1146 that Empire is.

They're definitely 1730X1146 (I think SW and Jedi are slightly bigger than that actually.) It's your browser settings. When you first open them up your browser won't show them full-size, depending on what browser you use - something like IE will do that. So, after you open them up click on them to make them full-size. The ones you linked will do the exact same thing, because they're identical files. Your browser must be auto-sizing them to fit your screen dimensions.