In my animation an image is resized, getting larger from the (fixed) top left to the bottom right.I wonder if there is a way to resize with a different starting point, e.g. from the bottom left to the top right?
There are two ways to accomplish this.
Changing the top/left values: along with the width/height changing, if you also animate the left/top at the same rate, then it will appear to grow from the opposite corner. You can even use recording and drag with the resize handle in the direction you want to go and the keyframes will be made for you.
Using Scale and the Transform Origin. The Transform Origin (the little marker when holding down the command key) will be the point at which scale transformation occur from. So if this is in the bottom-right corner, you can then expand with the scale (either holding down command using the resize handles or via the element inspector) and it will grow from that corner.
Thank you, perfect!