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Table Of Contents
18 Effects Parameter Reference
702
SpectraMatte Parameters
Bypass Parameter
Bypass toggles the SpectraMatte effect on and off. When it is selected, you see the original
foreground image in the Effect Preview monitor. When it is deselected, you see the
composite of foreground and background created by the effect. Use Bypass, for example,
when you want to use the eyedropper to select the key color from the blue or green screen
part of the foreground image.
Bypass on (left) and off (right)
Key Color Parameters
Key Color defines the color from the foreground image that you want to replace with the
background image. For more information on the parameter controls, see “Color Parameter
Controls” on page 622.
The SpectraMatte effect uses the color you select as the basis for defining a range of color
values to use in the key. In the SpectraGraph display, this range appears as a wedge keyed
out of the CbCr swatch. For an explanation of how this wedge is calculated, see “How the
SpectraMatte Effect Calculates Key Color Values” on page 255.
Parameter Description
Hue Specifies the hue or tint of the foreground elements. Hue is measured as values on a color wheel
ranging from –180 to +180.
Sat
(saturation)
Specifies the amount or intensity of the color. Values range from –100 to +100.
Bright
(brightness)
Specifies the brightness level. Values range from –100 to +100.
Cont
(contrast)
Controls the contrast of light and dark areas in the picture. Values range from –100 to +100,
where a value of 0 indicates the image is unchanged. A negative value reduces contrast. A
positive value increases contrast.