I made this image to demonstrate the meanings of different wallpaper zoom methods
It's pretty rudimentary for now; I'll add a description with exact details to each method if anybody's interested.
It would be a handy infograph to add to the general pool of images out there for the edification of newfags.
Also, I'm probably going to add OS compatibility lists (an OS icon next to all of its supported zoom methods), so could anybody with OS X, Windows 7, and Windows 8 tell me which methods are supported? (Also, any Linux users with Mate, LXDE, etc. please join in!)
The XCF project is at
https://dl.dropboxusercontent.com/u/98745514/DesktopScaling.xcf if anybody wants to contribute.
Edit it with Gimp.