Note that this scales how items are drawn to this Image, it does not scale the Image it's self.
Scales both axis by the value given. Items will be scaled by this, when they are drawn to this Image.
For example if you scale by 0.5, and draw to 200x100, then it will appear at 100x50 and take up half the amount of space.
The same scaling method, only this allows you to scale both x and y axis independently of each other.