The Threshold component creates a two-color version of the image provided by the Source input, based on the lightness of its pixels. Pixels with the lightness below Threshold acquire the Low color, and those with the lightness above Threshold acquire the High color. The edge between the colors can be softened by using the Smooth parameter. 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. This component can output HDR colors.
Provides the source image on which the Threshold operation is performed. This is a required input – in order to make Threshold work, this input must be connected.
Threshold: Map Input
Sets the threshold lightness level. All pixels of the source image with the lightness below the threshold level acquire the Low color; and all pixels with the lightness above the threshold level acquire the High color. The Threshold value ranges from 0 to 100. The lightness is calculated by averaging the R, G, and B channels of the source image. Since Threshold is a map input, its value can be controlled separately for different image areas by connecting a map component to this input.
Smooth: Map Input
Determines how smooth the transition between the Low and High colors is. The higher the Smooth value, the smoother the edge between the Low-color and High-color areas. Since Smooth is a map input, its value can be controlled separately for different image areas by connecting a map component to this input.
Sets the color for the pixels with the lightness below the threshold level. Since Low is a map input, its value can be controlled separately for different image areas by connecting a map component to this input. This input can accept HDR colors.
Sets the color for the pixels with the lightness above the threshold level. Since High is a map input, its value can be controlled separately for different image areas by connecting a map component to this input. This input can accept HDR colors.
