Cutting a subject out of its background is the most requested image task and the one that most often looks obviously wrong. The reason is almost always the same: edge pixels that are part subject and part background can't be handled by a simple keep-or-delete decision.

These articles explain what actually happens during background removal, why hair and glass are genuinely hard, and how to get clean results — including the shooting choices that make cutouts easy in the first place. They also cover what to do after the cutout: replacing the background convincingly, adding a shadow so the subject doesn't float, and exporting in a format that preserves transparency instead of silently filling it with white.