That's why Keylight adds the Screen Gain, Screen Balance, and Despill and Alpha Bias controls. Those criteria sound vague, not easily met-and it's true, they're somewhat vague, and often not met. The lesson contained in the table is that a healthy background color has a reasonably high saturation level and a distinct hue. Subtract a mathematically weighted amount of the screen color and make it semitransparent Key out the pixel completely, making it transparent How Keylight Makes Key DecisionsĬompared to Screen Color, the Pixel Is.Ĭonsider the pixel to be foreground, making it opaque From that, Keylight makes weighted comparisons between its saturation and hue and that of each pixel, as detailed in the following table. The core of Keylight involves generating the screen matte as mentioned earlier, the most essential step is the choice of screen color. This section offers a glimpse into the inner workings of Keylight, which will greatly aid your intuition when pulling a matte. The Inner Workings of KeylightĪ few decisions are absolutely essential in Keylight most of the rest compensate for the effectiveness of those few. Before delving into those (in the "Focusing In" section), let's look at how Keylight actually operates. Keylight anticipates these issues, offering specific tools and techniques to address them.
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Not only that, but the alpha will preview at speed, in full motion. You can switch a RAM Preview to Alpha Channel view by pressing Alt-4 (Mac: Option-4) without losing the cache.
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