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The dodge and the burn tool in Photoshop are really very essential to give a light and a dark effect to the areas of an image. Usually a photographer makes use of the lightings to compensate the light exposure.
But we have already captured image and we would like to make a change in the lighting scheme, the best tool would be the dodge and the burn tool which can be applied to the duplicate layer. In case of any modification it will not affect the original image quality.