Step 1: Create Image Stack; Auto and Step 2: Auto Blend Layers: Crop

The Auto-align layer and auto-Blend layers is for creating seamless collages of a single scene where certain elemenent change their position within the setting.

i) create an image stack ( either manually or by using the stack script) .
ii) Click on on of the layers to designate it as reference for the aligment.
iii) Then, Shift-click on the other layer and select it. Choose Edit > Auto -align Layers. In the dialog, choose Auto.

Now Choose edit > Auto Blend Layers.
Select the crop tool to crop uneven edges.