Image Timing Function
The timing function controls how motion is displayed
If you move an image using the linear timing function, it goes at one speed from stop to end. Abrupt start, abrupt stop.
The ease timing function causes the image to move more naturally. Accelerate to cruising speed, cruise for a while, then decelerate to stop.
Most of the time you will prefer the ease timing function, so we made that the default. There is a dropdown to make it easy to switch to linear.

ZapTheater's dropdown menu makes it easy to preview "different looks", it's so easy that it's fun.