Viz Artist User Guide
Version 3.14 | Published October 30, 2020 ©
Chroma Keyer
This Shader clear regions in a video defined by a color. The color-space of this Shader is YUV, which is defined as following:
The luminance (Y) component determines the brightness of the color, while the U and V components determine the color itself (the chroma). Luminance (Y) ranges from 0.0 (dark) to 1.0 (bright). U and V ranges from -0.5 to 0.5.
Note: This plug-in is located in: Built Ins -> Shader -> Effects
Chroma Keyer Properties
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Video: Sets the input video channel for keying. Be sure that for the set video channel the Keying Mode has been set to M-Zone (see Keying Mode).
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Blend: Sets the alpha for the key signal.
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Fit: Alters size to fit Screen or Object.
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Invert: Flips the key signal.
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Sampling Filter:
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Nearest: Takes color information from one pixel.
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1D-Filter: Takes color information after applying a 1D-linear filter.
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2D-Filter: Takes color information after applying a 2D-linear filter.
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Luminance: Sets the luminance.
Basic parameters for first method:
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HueAngle: Selects the color to key in YUV space.
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OpeningAngle: Determines tolerance for the color in YUV space.
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KeyGain: Determines gradient for borders to neighboring colors (1=soft, 10=sharp).
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SatMin: Determines lower saturation limit for keyed colors.
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SatMinGrad: Determines gradient for lower saturation limit (0=sharp, 1=soft).
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SatMax: Determines upper saturation limit for keyed colors.
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SatMaxGrad: Determines gradient for upper saturation limit (0=sharp, 1=soft).
Basic parameters for second method:
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U-Color: Determines U-value for color keying.
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V-Color: Determines V-value for color keying.
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UV-Diameter: Removes all colors between the reference UV and this diameter.
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UVGradient: Determines gradient for fade out at diameter border (0=sharp, 1=soft).
Removing keying from Highlights and Shadows:
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LumMin: Sets lower luminance limit for keyed colors.
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LumMinGrad: Sets gradient for lower luminance limit (0=sharp, 1=soft).
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LumMax: Sets upper luminance limit for keyed colors.
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LumMaxGrad: Sets gradient for upper luminance limit (0=sharp, 1=soft).
Sampling reference point:
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UVRangeCheck: Obtains information about the sampled color.
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URangeMin: Defines the minimum UColor that should be accepted.
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URangeMax: Defines the minimum UColor that should be accepted.
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VRangeMin: Defines the minimum UColor that should be accepted.
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VRangeMax: Defines the minimum UColor that should be accepted.
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SampleTrustiness: Determines percentage of samples in the limited UV-Color space.
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Pos. X: Deternines X-coordinate for sampling.
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Pos. Y: Deternines Y-coordinate for sampling.
Note: The origin of the coordinate system is in the upper left corner.
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Width: Sets number of pixels in x-direction.
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Height: Sets number of pixels in y-direction.
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Sample at Pos: Replaces XY-coordinates of the object center if Pos. X and Pos. Y are enabled. If disabled, the XY-coordinates are set by values in the interface.
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Get Sample: Samples another time the reference point.
See Also