Channel allows you to choose the color or gray channel in which the gamma
will be affected.
Load
The Load button lets you load a previously saved tone curve for use with
another image. Photoshop-saved curves can also be loaded.
Save
The Save button lets you save a tone curve together with its settings so
that the curve can be used in the future if necessary.
Using the Tone Curve tool:
1. Choose the Channel in which the curve will be modified.
2. If your Image Type is RGB, select Master to modify the tone curve in
the red, green, and blue color channels of the image simultaneously;
or select the color channels individually (red, green, blue) to modify
that particular color channel.
3. If your Image Type is Grayscale, only the Gray channel is available for
selection.
2. Choose the Method in which the curve will be modified. Select from
Line, Curve, or Gamma.
3. Click on the Curve Pointer tool, then click on the gamma curve to
define the points where the curve will be modified. You can then either
raise or lower the curve at that point and see changes to the image
accordingly.
4. When the changes are done, click OK. For more details on the effects
of the other action buttons, see the section
The Action Buttons.
5. To save a curve, click on the Save button. To load a previously saved
curve, click the Load button and specify the curve setting to be loaded.
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