To access the Curves dialog, select Layers>New Adjustment Layer>Curves.

When the Curves dialog is opened, the default curve is a straight line. The straight line maps the input values to the output values leaving the image unchanged. The horizontal axis is the input values for the tones; the vertical axis, the output values. The tones are displayed on the bottom and left of the curve as a

black to white gradient. Use this gradient to visualize the various tones as you adjust your image.

To make a simple curve, click on the curve line to create a gradation point, and drag the point upward. (Note: You can also use the keyboard arrow keys to move gradation points.) This is a classic brightening curve.

Midtone values are mapped to brighter values, thus brightening the overall image

Midtone values are mapped to brighter values, thus brightening the overall image

Click on another part of the curve to add a second point and drag it around to see the effect on the curve. Points can be removed simply by dragging them outside of the curve box.

Complex curves can create radical changes to the image

Complex curves can create radical changes to the image

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