How to Change indoor Studio Background in Photoshop

Remove rough spots:

• In the Properties, a panel of the Select and Mask workspace, move the Shift Edge slider to the left to refine the edges of the selection, and choose Output to Selection. Note: when leaving Select and Mask, the original background comes back; you’ll fix this in the next step. 

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Add a new background:

• With the green layer selected, set the Blend Mode to Soft Light, and reduce the Opacity setting. Larson applied a dark blue Solid Color adjustment layer to give each of the layers below it a finishing color cast. Set the Blend Mode to Soft Light and also reduce the adjustment layer’s Opacity setting.

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