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Curve Button
The Curve tool is used to adjust the brightness properties of midtone
pixels in an image. Once you click on the Curve button, the following
dialog box will appear:
An introduction to each component in the
dialog box and a description of how to use
the Curve tool to adjust an image follows.
Colour Channel box
Use the Colour Channel box to select the colour channel to be
adjusted. This allows you to adjust the curve property of each
Colour channel independently.
Tonal Map
The x-axis in the Tonal Map represents the input
brightness level of the pixels in an image. The y-axis
represents the output brightness level of the image. By
clicking and dragging the curve to change its shape,
you can adjust the difference between input and output
brightness levels of an image without making large
changes to the dark and bright areas. If we compare
the following images and their Tonal Maps: