User Guide

ADOBE PREMIERE PRO 2.0
User Guide
363
The following Non Red Key settings are adjusted in the Effect Controls panel:
Threshold Sets the levels of blue or green that determine transparent areas in the clip. Dragging the Threshold slider
to the left increases the amount of transparency. Use the Mask Only option to view the black (transparent) areas as
you move the Threshold slider.
Cutoff Sets the opacity of nontransparent areas specified by the Threshold slider. Higher values increase trans-
parency. Drag to the right until the opaque area reaches a satisfactory level.
Defringing Removesresidualgreenorbluescreencolorfromtheedgesoftheopaqueareasofaclip.ChooseNone
to disable defringing. Choose Green or Blue to remove a residual edge from green-screen or blue-screen footage,
respectively.
Smoothing Specifies the amount of anti-aliasing (softening) that Adobe Premiere Pro applies to the boundary
betweentransparentandopaqueregions.ChooseNonetoproducesharpedges,withnoanti-aliasing.Thisoptionis
useful when you want to preserve sharp lines, such as those in titles. Choose Low or High to produce different
amounts of smoothing.
Mask Only Displays only the clip’s alpha channel. Black represents transparent areas, white represents opaque areas,
and gray represents partially transparent areas.
See also
“About keying” on page 355
About the Luma Key
The Luma Key creates transparency for darker values in the image, leaving brighter colors opaque. Use the Luma Key
to create a subtle superimposition or to key out dark areas.
Adjust the following settings as necessary:
Threshold Specifies the range of darker values that are transparent. Higher values increase the range of transparency.
Cutoff Sets the opacity of nontransparent areas specified by the Threshold slider. Higher values increase trans-
parency.
YoucanalsousetheLumaKeytokeyoutlightareasbysettingThresholdtoalowvalueandCutofftoahighvalue.
See also
“About keying” on page 355
Multiply Key and Screen Key
The Multiply Key creates transparency in the bright areas of the clip. Conversely, the Screen Key creates transparency
in the dark areas of the clip. Like the Luma Key, the Multiply and Screen Keys are most effective when the image that
you are keying contains highly contrasting dark and light areas.
The following Multiply Key and Screen Key settings are adjusted in the Effect Controls panel:
Opacity Reduces the opacity of the clip being keyed. Drag the control to the left to reduce the clip’s opacity.
Cutoff Determines the luminance level required for an area to be transparent. Drag the control to the left to decrease
the required luminance level.