The Tone Curve component adjusts the entire tonal range of the image provided by the Source input using the tone curve connected to the Curve input. This operation affects only the color of the source image, it does not affect its alpha channel. This is a map component, it can be located in the Adjustments category on the Components Bar. For more information on tone curves, see Tone Curve Explained.
Provides the source image on which the adjustment will be performed. This is a required input – in order to make the Tone Curve component work, this input must be connected.
Preserve Color: Map Input
When turned on, the adjustment affects only the lightness of the source image, leaving its hue and saturation unchanged. For more information, see Preserve Color: How It Works. When a map component is connected to this input, the state of the checkbox is determined separately for different image areas by the brightness level of the image supplied by that component. The brightness level of 0 to 50 corresponds to unchecked Preserve Color, and the level of 50 to 100 corresponds to checked Preserve Color.
Curve: Curve Input, Required
Supplies the tone curve to be applied to the source image. This is a required input – in order to make the Tone Curve component work, this input must be connected.
