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In both alpha-channel mattes and luminance mattes, pixels with higher values are more transparent. Using luminance is handy when you want to create a track matte from a layer without an alpha channel, or a layer imported from a program that can’t create an alpha channel. You define transparency in a track matte using values from either its alpha channel or the luminance of its pixels. If you want to animate the track matte and fill layers using identical settings, you can precompose them.

When you animate the track matte layer, you create a traveling matte. You can animate either the track matte layer or the fill layer. You’ll need two layers-one to act as a matte, the other to fill the hole in the matte. When you want one layer to show through a hole in another layer, set up a track matte.

Track matte key premiere cc