Instruction by
Let Photoshop automatically select the main subject for you.
What you'll need
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What you learned
How to automatically select a subject
Use Select > Subject to tell Photoshop to automatically select the main subject on a layer.
How to replace the background around a selected subject
Then add a layer mask. The layer mask automatically hides the area that was not selected—the background around the subject. With the original background hidden, the layers below become visible and appear as a new background for the subject.