Simply, a depth map is a picture where every pixel has depth information, rather than RGB, and it is normally represented as a grayscale picture. Depth information means the distance of the surface of scene objects from a viewpoint. A depth map contains information about the distance between the surface of objects from a given viewpoint. When this is merged with the source image, a 3D image is created. It will appear as though the original source image has depth to it, giving it an almost lenticular effect.
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