Hue Adjust NodeThe Hue Adjust node enables you to perform hue-based color adjustments to an image using the HSV and HSL color models. (To adjust RGB color values, use the Color Correct Node .) Hue Parameter Tab![]() Color SpaceThe Color Space menu allows you to choose the colorspace to use for the adjustment:
The most significant difference between the two colorspaces is that, for HSV, maximum saturation values for any hue are on the same plane in the colorspace as maximum brightness (Value) levels; whereas for HSL, maximum saturation values are on the same plane as midrange brightness (Luminance) levels. HueThe first parameter, Hue, allows you to rotate the color distribution vectors of the image 360 around the axis of the colorspace by selecting a value in the range of -180 to 180. A parameter value of 0 represents the hue data of the source image. You can key a numerical value into the data entry field or use the mouse to set the tuner to the desired value.
SaturationThe second parameter, Saturation, allows you to adjust the chrominance level of the image by keying a numerical value in the range of -1 to 1 into the data entry box or by using the mouse to set the tuner to the desired value. A value of 0 always represents the input image data; -1 results in complete desaturation of the image (monochrome); and 1 creates maximum saturation of the hues. On the Monitor Scope, the degree of saturation is represented by the amplitude of the vector signal, with high saturation indicated by vectors near the outer edge of the scope and low saturation near the center. Value / LuminanceThe third parameter is either Value, if HSV is chosen from the Color Space menu, or Luminance, if HSL is chosen. Both Value and Luminance represent the relative intensity, or brightness, of the color data. Value and Luminance both use the same range of -1 to 1. A value of 0 represents no change to the input image; -1 results in the minimum brightness; and 1, the maximum brightness. A parameter setting of -1 will always result in a completely black image for both HSV and HSL colorspaces. A setting of 1, however, will result in blown-out colors for HSV, whereas the same brightness setting for HSL will result in a completely white image.
Control Image ParametersThe Control Action and Control Channel menus enable you to specify how an optional control image input will govern the node operation, as explained in "Using Control Images with Filter Nodes ." |