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Digital Compositing with Nuke by Lee Lanier

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CHAPTER 5

 

image

Keying

Professional compositors often find it necessary to remove bluescreen or greenscreen from a live-action plate. Fortunately, a host of tools have been developed for such a task. The tools are generally called chroma keyers, as they target specific colors. You can use chroma keyers in a wide variety of ways to generate alpha mattes and thus impart transparency to a bitmap or image sequence that carried no alpha channel to begin with.

This chapter includes the following critical information:

•   Chroma key basics

•   Simple Nuke keyers

•   Advanced Nuke keyers

Chroma Keying

Chroma keying is a critical part of professional ...

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