Curves adjustment

Adjust the color, tone and alpha channels with the curves adjustment, either on individual channels or by adjusting the master curve.

Before and after adjustment applied.

You can use the Curves adjustment to manipulate individual color channels. The adjustment can be used on placed images as well.

Apply this adjustment via the Adjustments panel using the following settings:

Color space—select a color mode (Grey/RGB/CMYK/LAB) from the first pop-up menu.
Channels—specify a single color channel to apply the adjustment to, including the layer's alpha channel. Master (the default choice) applies the adjustment to all color channels, excluding alpha channel.
Spline—displays the curves spline chart which can be shaped to adjust the tonal range.

To adjust a curves graph:

On the curves graph, do any of the following: