About Masking

Masking is the process of hiding a region of an image. You can use masks to remove the area outside the mask shape and keep the area inside the mask shape, or you can use masks to remove the area inside the mask shape and keep the area outside the mask shape.

Pixel Masking lets you temporarily isolate specific areas of the footage. You can apply effects to the selected area of an image without affecting the rest.

You can use garbage masks to key undesired elements in an image and to do rotoscope work. A garbage mask affects the image's alpha channel, which is where the transparency information is stored. You can use a mask to create the alpha channel, or you can use a mask to add to an alpha channel.

Mask Type	Description
Garbage matte	A matte that isolates unwanted elements from the primary element in an image. Garbage mattes are also referred to as garbage masks.
Auto Tangent	When selected, the mask is created with tangents.
Intensity	Defines the alpha value defined by the mask.
Opacity	Defines the transparency of the mask.
Invert	The area outside of the mask is covered by the garbage mask settings.
Edge Distance	The inner or outer offset from the edge of the mask.
Edge Position	The position of the edge handle from the first control point of the mask.
Edge In/Out	The inner/outer offsets from the edge of the mask.

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