4. Open both images in Photoshop. Press ctrl+a and go to edit>copy. Go to file>new and press ok. Edit>paste the image into the new document. Go to the other image, press crtl+a, and copy and paste it into the new document. Leave the background white.
5. Double click the layer names to rename them to “left” and “right” accordingly.
6. Set the top image to 50% opacity and drag the top image to align with the bottom.
7. Select the area only where the two images overlap. Go to image>crop to crop the image.