Add contrast to a photo
You can add contrast to an image in two ways, depending on the problem.
If the image needs overall contrast because it doesn’t use the full tonal range, choose Image > Adjustments > Levels. Then drag the Shadow and Highlight input sliders inward until they touch the ends of the histogram.
Image pixels don’t extend to the ends of the graph, indicating that the image is not using the full tonal range.
A. Shadow Input slider
B. Highlight Input slider
If the image uses the full tonal range, but needs midtone contrast, choose Image > Adjustments > Curves. Drag the curve into an S shape.
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