Similar general comment as Ofnuts, a video editor such as OpenShot will string together png images, and add any number of transitions available.
However for Gimp. An old plugin MathMap. Lots of filters available, a few of them transitions between two layers. (edit: look in the Extra-Animation section )
As you might expect, this works in RGB mode and you might have a little hand editing - remove the starting frame - reverse stack order - before assembling into a gif animation.
The link to the plugin and explanations here: https://www.gimp-forum.net/Thread-MathMap-for-Linux It does work with an appimage, if that is what you are using. It does take a bit of practice.
![[Image: xcFlxh8.gif]](https://i.imgur.com/xcFlxh8.gif)
However for Gimp. An old plugin MathMap. Lots of filters available, a few of them transitions between two layers. (edit: look in the Extra-Animation section )
As you might expect, this works in RGB mode and you might have a little hand editing - remove the starting frame - reverse stack order - before assembling into a gif animation.
The link to the plugin and explanations here: https://www.gimp-forum.net/Thread-MathMap-for-Linux It does work with an appimage, if that is what you are using. It does take a bit of practice.