Make a photo composite by painting on a layer mask to hide and show parts of a layer.
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How to create a layer mask from scratch
Add a layer mask to a layer on which you want to hide some content. At first, the new layer mask is white, so all the content on the masked layer is still visible.
How to hide content by brushing on the layer mask with black
Use a brush tool to paint on the layer mask with black. This hides the corresponding parts of the masked layer, allowing content on layers below to come through.
How to show content by brushing on the layer mask with white
If you change your mind about hiding some content, bring it back into view by painting on the layer mask with white.
How to use these techniques to create a new image from multiple photos
One use for brushing on a layer mask is to combine multiple photos into a new image. You can use the same technique to adjust part of a photo, to retouch part of a portrait, or to limit a creative effect to part of a design.