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T he Levels command has long been one of the most useful tonal tools in Photoshop. Not only can you use it to lighten or darken an image, you can also correct colour casts, increase contrast, fix exposure, and introduce colour shifts. It’s worth noting that if you shoot in raw, it’s best to make as many tonal edits as you can in Camera Raw before opening the image into Photoshop; but if you need to alter tones once your image is open, Levels offers a fine degree of control.