The topic heading says it all. Why is that so? And can it be changed? I only noticed after getting weird results when scaling images.

I understand if this is trying to keep the beginner from scaling images too high and getting bad-looking results, but I've often had images that were only one pixel in hight and that I wanted to strech across half the screen, in height.

Right now I want to create a scrollbar that changes height when the screen resolution changes (and thus the scrollable area's size) and I can't scale it to the propper height.