Rounded corners in Photoshop
https://www.lukeko.com/11/rounded-corners-in-photoshop 0- Layer > Vector Mask > Reveal All
- Click "Rounded Rectangle" and select radius of corner
- Click once > Select size of rectangle to be same as size of image
- Click "Align to" > "Canvas" and center the mask
https://www.instructables.com/Photoshop-CS6-Create-Rounded-Corners-in-Photo/