Intro to effect masking in Final Cut Pro for Mac

Using the masking tools built into most clip effects in Final Cut Pro, you can isolate and control which areas of the video image are affected by clip effects, including color corrections. These isolated areas are called masks.

There are three types of effect masks in Final Cut Pro:

Magnetic Mask: Easily isolate people, objects, and shapes from the background using machine learning analysis, without time-consuming manual tracking or rotoscoping. See Add a Magnetic Mask to a video effect.
Shape mask: Apply a mask to the area defined by a shape, such as a circle, rectangle, or irregular shape that you draw. See Add a shape mask to a video effect.
Color mask: Apply a mask to a specific color range, so only areas in your clip that contain colors within the range are part of the mask. See Add a color mask to a video effect.

You can apply a color mask and any number of Magnetic Masks or shape masks to a clip effect, and you can set multiple masks to interact in different ways within an effect. See Example: Add shape masks to a color mask in a color correction effect.

You can animate any effect mask in Final Cut Pro, just as you can animate most effect parameters.

The viewer showing a clip with onscreen controls for a shape mask

For information about using traditional masking tools to create areas of transparency in an image, see Intro to masking.

Note: Clip effects in the Keying and Masks categories in the Effects browser do not have the built-in effect masking tools described in this section.

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Final Cut Pro User Guide for Mac

Intro to effect masking in Final Cut Pro for Mac