Curves (tonality)
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A Curve in Digital image editing is a way to emphasize colours or other elements in a picture.
Curves can usually be applied to all channels together in an image, or to each channel individually.
Applying a curve to all channels typically changes the brightness in part of the spectrum. The software user may for example make light parts of a picture lighter and dark parts darker to increase contrast.
Applying a curve to individual channels can be used to stress a colour. This is particularly efficient in the Lab color space but it can also be used in RGB, CMYK or whatever other color models the software supports.
