Cloning is the process of copying, repeating, or duplicating pixels from one part of an image, or taking pixels from another image, and placing them on another part of the image. First, you sample, or select, an area that is to be the source of the clone, and then you apple the selected area where it is needed. This is a basic tool in image manipulation, and you will find yourself constantly turning to it whenever you need, say, to replace a dust speck in the sky of an image with an adjacent bit of the sky, or remove stray hairs from a face by cloning nearby skin texture over them.
This is only the start, however. such cloning makes an exact copy of the pixels, but you can go much further.
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