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— In/Out Ratio: Using In/Out Ratio can help eliminate fringing. Raising In/Out Ratio will fill in small black holes in the matte, while lowering In/Out Ratio below 0 will eliminate speckling by pushing small white bits of the matte toward black.
— Morph Operation: You can choose Shrink or Grow to dilate or erode the edges of the matte, or you can choose Opening or Closing to plug or expand holes to clean up a ragged matte.
— Morph Radius: Adjusts how much to shrink, grow, open, or close the key.
— Denoise: Provides a distinct way to post-process extracted keys to selectively reduce the noise in a key, getting rid of stray areas of qualification and softly filling holes in a matte.
— Shadow: Adjusts key strength based on the darker parts of the original image.
— Midtone: Adjusts key strength based on the midtones of the original image.
— Highlight: Adjusts key strength based on the brighter parts of the original image.
— Post Filter: Performs a final clean-up of the key, using the original image for reference; useful for bringing back some fine detail in sharp edges or hair.
Garbage Matte
These controls let you crop out other unwanted things in the frame, such as lighting fixtures, boom microphones, tracking patches, etc.
— Matte Shape: You can choose either a Rectangle or Ellipse with which to crop around the subject you’re keying. Choosing None turns off Garbage Matte. When a garbage matte is enabled, the Open FX Overlay mode of the Viewer shows an on-screen control for adjusting the shape and position of the garbage matte.
— Edge Softness: Lets you soften the edges. Defaults to 50; the range is 0 (no softening) to 100 (maximum softening).
— Invert: Inverts the garbage matte.
— Center X and Y: Lets you adjust and keyframe the position of a garbage matte.
— Bounding Width and Height: Lets you adjust the width and height of the garbage matte.
— Rotation: Lets you adjust the angle of the garbage matte.
Output
The Output controls let you choose how the image is output, composited, and displayed in the Viewer.
— Output: This menu offers three options for which channels are output from the effect.
— Alpha Highlight: Displays the transparent part of an alpha channel as gray and the solid part of an alpha channel in full color.
— Alpha Highlight B/W: Displays the black and white alpha channel, which is often helpful when sampling additional areas to key.
— Final Composite: The keyed image is displayed composited over any video track below it.
— Use Alpha: A common control in many Resolve FX and 3rd party Open FX plugins; this checkbox determines if the Alpha channel is used when compositing over another video track. It can be used instead of choosing RGB Only (Blank Alpha) from the Output menu.