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, as modified by the key settings.
Drop Shadow
Adds a 50% gray, 50% opaque shadow offset from the opaque areas of the
original clip image by four pixels down and to the right. This option works best with
simple graphics such as titles.
Using the Blue Screen and Green Screen keys
The Blue Screen and Green Screen keys create transparency from true chroma blue and
true chroma green. Use these keys to key out well-lit blue or green screens when creating
composites.
Adjust the following Blue Screen and Green Screen key settings as necessary:
Threshold
Drag to the left until the blue or green screen is made transparent.
Cutoff
Drag to the right until the opaque area reaches a satisfactory level.
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Adobe Premiere Pro Help Superimposing and Compositing
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Smoothing
Specifies the amount of anti-aliasing (softening) that Adobe Premiere Pro
applies to the boundary between transparent and opaque regions. Choose None to
produce sharp edges, with no anti-aliasing. This option is 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, as modified by the key settings.
To fine-tune edges, drag Threshold and Cutoff sliders in small increments.
Using the Non Red key
The Non Red key creates transparency from green or blue backgrounds. It is similar to the
Blue Screen and Green Screen keys, but it also lets you blend two clips. In addition, it
helps
reduce fringing around the edges of nontransparent objects. Use the Non Red key to key
out green screens when you need to control blending, or for when the Blue Screen or
Green Screen key doesn’t produce satisfactory results.
Adjust the following settings as necessary:
Threshold
Drag to the left until the blue or green screen is made transparent.
Cutoff
Drag to the right until the opaque area reaches a satisfactory level.
Defringing
Removes residual green or blue screen color from the edges of the opaque
areas of a clip. Choose None 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 between transparent and opaque regions. Choose None to
produce sharp edges, with no anti-aliasing. This option is 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, as modified by the key settings.
Using 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 will become transparent. Higher
values increase the range of transparency.
Cutoff
Sets the opacity of areas that have been specified by the Threshold slider. Higher
values increase transparency.
