Open two images in separate layers (see Layer Mask 1 for how to do this.)
With top Layer selected click Add Layer Mask.
Select the Pen Tool.
Draw the area you wish to mask.
Select Path Selection Tool
Right click on the Path you have drawn
Click Make Selection
0 Feather Radius gives a sharp edge.
The higher the number the softer the edge.
Select Paint Bucket Tool
Make sure Foreground Colour is Black.
Fill the selected area.
See what happens.
Now try undoing until you have the selected area unfilled.
Go to Select > Inverse.
The selected area inverts.
Now fill the selected area.
With top Layer selected click Add Layer Mask.
Select the Pen Tool.
Draw the area you wish to mask.
Select Path Selection Tool
Right click on the Path you have drawn
Click Make Selection
0 Feather Radius gives a sharp edge.
The higher the number the softer the edge.
Select Paint Bucket Tool
Make sure Foreground Colour is Black.
Fill the selected area.
See what happens.
Now try undoing until you have the selected area unfilled.
Go to Select > Inverse.
The selected area inverts.
Now fill the selected area.
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