Adjusting tone curves

In Edit, you can use the Curves tool to change the tonal range of an image. Select the RGB color channel to adjust the entire range of the image, or select a specific color.

You can save your options as a preset for future use.

To adjust the brightness curves in an image:

  1. In Edit mode, in the Exposure/Lighting group, click Tone Curves.
  2. Set the options as described below.
  3. Do one of the following:
    • Click Apply to apply your changes.
    • Click Done to apply your changes and close the Curves tool.
    • Click Cancel to discard all changes and close the tool.

ACDSee Photo Manager Note Adjusting tone curves

Click Reset to clear your changes and reset to default settings. If you saved your changes, you cannot reset your settings.

Curves options


Specifies the color channels to adjust.

Show Histogram

Toggles the histogram display on and off.


Displays a graphic of the color information levels in the image, based on the selected channel. Click and drag the line to manipulate the curve. Each time you click the curve, a new node is added. You can drag the nodes up and down the curve. To remove a node, drag the node up and out of the graph, or down and out of the graph.

Exposure warning

Highlights overexposed and underexposed areas of the image. Overexposed pixels turn red, underexposed pixels turn green.

See also:

Adjusting tone curves