Sorry about my english. How can I animate a layer scale (x and y) gradually, not lineally? I mean, if I animate from 100% to 0% in 100 frames lineally, the difference between the 1st frame and the 2nd frame is 1%, but between 99th and 100th is 100% (1% to 0%). It can be almost fixed by easing the end of animation, but is not proportionally the same. I need the scale value to decrease proportionally each frame.
For example, 100 _ 99 _ 98.01 _ 97.02 _ 96.05...
this is 100 _ 100*0.99 _ 99*0.99 _ 98.01*0.99 _ 97.02*0.99...
Maybe with an expression I can detect the previous frame value and multiplicate it. I don't know.
Thanks for your help!! It worked really good for a "zoom earth from the space" project with all the growing resolution layers linked to one of them. I made a lineal (gradual) scale animation with your expression, then precompose it and remapped the time for ease the first and last keyframes.