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Click the button, then hold down SHIFT and click an area of the image that you’d like to clone. Release SHIFT, then move the cursor over the area where you want the cloned image to be and click and drag; the area around your source will then appear wherever you click and drag. This is a very useful tool for covering imperfections (ex. cloning a smooth area of skin over a blemished area).
What is Clone Stamp tool ?