The Bias controls


show more The Bias controls provides you with in-depth training on 3D + Animation. Taught by Steve Wright as part of the Nuke 6 New Features show less
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The Bias controls

Now let's take a look at Bias. We will start by looking at the Alpha Bias. We'll switch to this picture here, close that Keylight and open this one. The Bias controls are right here and they are designed to cope with seriously discolored elements. I didn't have a green screen discolored badly enough to demonstrate this, so I have just borrowed the one from the Keylight tutorial. The first one we will look at is the Alpha Bias. If we pull a key, we'll sample our image, pull our key, switch to the Composite, because of the serious red Bias in the green screen we got a terrible matte and a semi-transparent composite.

The way we tell Keylight about this red color bias is we turn on the Alpha Bias eyedropper and we do a sample in the foreground. There, much better. Now, with Keylight, every one of these samples results in a single value. So if you sample different areas, you will get different results. So you might look around for the best overall sample to use. Now we will take a...

The Bias controls
Video duration: 2m 37s 4h 6m Intermediate Updated Feb 13, 2012

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The Bias controls provides you with in-depth training on 3D + Animation. Taught by Steve Wright as part of the Nuke 6 New Features

Subjects:
3D + Animation Video
Software:
Nuke
Author:
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