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2 Right-click any empty area of the Node Editor, and choose Add Alpha Output to reveal
the Node Tree output on the right that lets you assign a key to be used to define clip
transparency.
3 Connect one of the EXT MATTE node’s triangular key outputs to the Alpha output at
the right of the Node Editor.
The node setup for using an external matte to composite two layer
The areas of the matte defined by the key are now rendered transparent.
The final composite created using the external matte node
Key Palette Controls for the External Matte Node
When you select an EXT MATTE node, the Key palette displays different parameters only for
mattes. Be aware that you must turn off the Lock Matte checkbox before you can make
adjustments to transform the matte.
The Key Palette showing a texture layer added as an EXT MATTE node
Transform: Standard Pan, Tilt, Zoom, Rotate, Width, and Height parameters let you
transform a matte to fit the image better.
Flip Image: Two buttons let you flip the matte clip horizontally or vertically.
Offset: Adjust this parameter to offset the start point of a matte clip.
Chapter – 126 Combining Keys and Using Mattes 2865