About RGB Difference Key
The RGB Difference Key is a simpler version of the Chroma Key. It lets you select a range for the target color, but you cannot blend the image or adjust transparency in grays. Use the RGB Difference Key for a scene that is brightly lit and contains no shadows, or for rough cuts that don’t require fine adjustments.
Note: The Difference Matte uses a matte to define the alpha channel
much as the RGB Difference Key uses a color. For more
information, see Difference Matte effect.
The following RGB Difference Key settings are adjusted in the Effect Controls panel:
- Color
- Specifies the color in the video that will be made transparent by the mask.
- Similarity
- Broadens or reduces the range of the target color that will be made transparent. Higher values increase the range.
- 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.
- Drop Shadow
- Adds a 50% gray, 50% opaque shadow offset 4 pixels down and to the right from the opaque areas of the original clip image. This option works best with simple graphics such as titles.