How to create an "easy dissolving effect"?

[Joan5C66]

Hello. I would like to know how to create an effect like the one shown in the screenshot below (= like this "easy dissolving effect"). Thanks!

[Roland Kahlenberg]

Could be a Gradient Wipe which you'll find in Effect>Transition. The trick here is to create a customized gradient which will help to dictate which areas/pixels are affected by the wipe transition effect.

[Mylenium · Accepted solution]

Pretty much looks like a few animated parameters on a Roughen Edges effect, to be honest, such as the scale, softness and depth of the edges. All you need in preparation is to have the elements separate from the background.

Mylenium