What does it mean when a scanner or printer has asymmetric resolution (e.g., 600 x 1200)?
If you print/scan something that is quadratic, would you get different quality if you rotated it 90 °? Isn't that weird? I have even seen 600 x 38 400 on some printers. Part of that is that they can print RGB in several levels of intensity, which in turn affects how they rasterize to emulate colours, but still. And why does that only affect the resolution in one direction?