When setting a wallpaper you can choose from tile, zoom, center, scale, fill or span options. What do they mean?
How scale option is different from zoom and span? I can't see the difference on any of my wallpapers.
This is going to be tricky to see but...
Sorry I can't provide samples other then tile, but the images depend strongly on your monitor. You should be able to easily see the options in effect if you use a seriously undersized and bad aspect ration image to test with.