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Digital Compositing with Nuke by Lee Lanier

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CHAPTER 4

 

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Alpha Mattes, Merging, and Rotoscoping

Compositing necessitates the combination of bitmaps, image sequences, videos, and/or procedurally-generated patterns. Whereas a layer-based program simply stacks layers with preference to upper layers, Nuke combines inputs through various “merge” nodes. Regardless of the compositing program used, a layer or input’s alpha channel must be considered as it carries pixel transparency information. In Nuke, if an input does not carry an alpha channel, you can synthesize one by creating an alpha matte. You can generate such a matte by manipulating RGB information, targeting a specific color ...

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