The Non Red Key creates transparency from green or blue backgrounds. This key is similar to the Blue Screen and Green Screen Keys, but it also lets you blend two clips. In addition, the Non Red Key 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 when the Blue Screen or Green Screen Keys don’t produce satisfactory results.

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 transparency. 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. Black represents transparent areas, white represents opaque areas, and gray represents partially transparent areas.