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You do it with layers and masks. A mask will show the layer it associated with where the mask is white and the layer(s) below where the mask is black. Where it is grey it will be semi transparent.
In the simple example below, there are two images each on a separate layer. The upper layer has a mask and the transition from black to white is a soft gradient (made with the gradient tool) - therefore the transition between those layers is also a soft gradient.
Hope that helps
Thank you a lot Dave for the tip. That's exactly what I was looking for.
Unfortunately I do not have much experience in Photoshop. Would it be asking a lot more step by step how to do this?
Some points that leave me in doubt:
1. Have you put the pictures already in 1: 1?
2. How did you put these blanks that appear in the thumbnails?
Thank you, and more for your patience.
(sorry my english im from Brazil)
1. I opened the lower layer and extended the canvas (by dragging with the crop tool which can extend as well as crop)
2. I placed the second image on a new layer - by dragging it in from another open document with the move tool.
3. I used the move tool to position the image on the upper layer so that it overlapped the image on the lower layer. The blank areas on each thumbnail are where the image does not extend the full size of the canvas. You only see the thumbnail that way if the options in the layer panel (top right of the panel) are set as "Thumbnail contents -Entire document"
4. I added a layer mask to the second image using Layer - Layer Mask - Reveal All
5. I then selected that layer mask and used the gradient tool to draw a gradient starting and finishing within the overlapped area
I hope that helps you