![]() This value serves as the base for the contrast operation.Texture mapping data of Rhino objects in other software Rendering WIP Ramping occurs in values lower than the cutoff value. Gradient input values that fall below the cutoff value will be affected by the operation.Īdd a negative or positive number to smoothly ramp to from the original values. Here is a breakdown of what each input does: It then applies a smooth contrast to the gradient, based on the inputs. The SmoothThreshold function takes in a gradient, an interpolation rate, and a threshold value (Cutoff Value). The incoming texture having its hue shifted. How far around the color wheel to shift the incoming hue. A shift of 1.0 (100%) gives no change, as this is the equivalent of rotating completely around the color wheel. For instance, a shift of 0.5 (50%) will shift to a complimentary hue, or the hue on the opposite side of the color wheel. This percentage is 1-based and centered around the color wheel. ![]() The HueShift function offsets the current hue value of an input color by a given percentage. Like the CheapContrast function, this node takes in a scalar by default, meaning it is suited for single channels or black and white images. Set to true if you want to invert the power curve (this generally lowers contrast instead of boosting it). This controls the interpolation between the three points (black, white, and middle). Set to true if you want to define your own interpolation curve using the Interpolation Power input.Ī power node applied to the interpolation. Pick a value from the input image that will get replaced with the value from Middle Point. Set the new value for the previous value of 1. Replaces the old value that matches the Middle Point input value. Set the new value for the previous value of 0. However, you may input your own custom interpolation curve if you wish. By default, the three remapping points are interpolated linearly. However, unlike the CheapContrast functions, this function provides full control in that it gives the user ability to adjust interpolation of lights, darks, and grays (gamma). This is similar to applying a Levels adjustment in Photoshop. The 3PointLevels function takes in an image and remaps the values of each channel across 3 points (white, black, middle). This is similar to applying a Curves adjustment in Photoshop and setting the RGB curve to an S-curve or using the Increase Contrast (RGB) preset. The SCurve function boosts contrast of an image by interpolating the values of each channel values of an image along an S-curve. The base image having its contrast boosted. Unlike the regular CheapContrast function, this function can take in a Vector3 as the input, allowing it to perform contrast operations on a color image. The user may control the degree to which the contrast is boosted. This is similar to applying a Levels adjustment in Photoshop, and pulling the black and white flags in a bit. The CheapConstrast_RGB function boosts the contrast of an input by remapping the high end of the histogram to a lower value, and the low end of the histogram to a higher one. For contrast boost on full-color images, use CheapContrast_RGB. This function takes in a scalar value rather than RGB, meaning it is particularly suited to black and white images or single channels. ![]() The channel or black and white image having its contrast boosted. The CheapContrast function boosts the contrast of an input by remapping the high end of the histogram to a lower value, and the low end of the histogram to a higher one. This maps out where each color will be applied, as per above. This color will be applied wherever the alpha supplies highlights to whites. This color will be applied wherever the alpha supplies midtones. This color will be applied wherever the alpha supplies dark tones to blacks. The 3ColorBlend function blends between 3 input colors based on a grayscale alpha, in the following manner: They are useful in that they allow corrective actions or variations on a texture without having to worry about the overhead of loading a separate version into memory. The Image Adjustment functions exist as a way to perform basic color correction operations on textures. ![]()
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