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Author Steve Wright explores the new features found in the 3D digital compositor Nuke 6. The course introduces the RotoPaint node for drawing and painting effects, the Keylight keyer for creating mattes and composites, and the SplineWarp node for warping images. The course also explains how to merge keys, animate with keyframes, and create image-based blurs. Exercise files accompany the course.
Nuke 6 New Features was created and produced by Steve Wright. We are honored to host his material in the lynda.com Online Training Library®.
With the shadows properly adjusted, we can now turn our attention to spill suppression. The Spill tab contains all the adjustments for refining Ultimatte's superb spill suppression. By default, it's enabled. Let's take a look at the umbrella. Since, it's a semi-transparent object, it's heavily influenced by the spill suppression. First of all, watch what happens when I enable and disable the spill suppression. By default, the spill suppression is enabled, and normally you're going to leave it that way. We have adjustments here that can be used to dial in the spill suppression to either increase it or decrease it in cool, warm, midtones, brights, darks, any part of the picture you want.
Watch what happens when I adjust the cool. Keep in mind that that umbrella is kind of a cool color, as far as color temperature goes. Now moving it to the right means I am pulling out more blue. I am increasing the amount of spill suppression. Moving it to the left, I am reducing the amount of spill suppression, so it turns more blue. I'll set that back to the default. The warm colors, such as these jackets, if I increase the spill suppression I'm pulling more blue out of them and I go down the other way, I'm adding more blue back in.
We'll put that back to default. Similarly, you can adjust the midtones and the brights. In fact let's take the brights, and see umbrella is also a bright. So, the umbrella will be affected by the brights as well as the cool slider. We'll put that back. Ambiance. Ambiance is the spill-replacement color, and it is by default 0.5, but we can certainly dial that up. I'm going to turn it into heavy red, just so you can see the effect. And now I can dial all the strength down and up, and you can see the umbrella picks up more red, turning it white.
I'll put that back to default and reset our color. The background veiling adjustment overrides the default background suppression, and generally speaking, you don't want to mess with this one. It will really destroy the spill suppression. If you're working on the spill suppression and you get things all jacked out of shape and you're lost and confused, just click the reset button and that puts the entire spill suppression algorithm back to the default state. We'll home the viewer in order to take a look at the last tab to adjust, which is the Cleanup tab.
Normally, you want to leave this tab alone. Let's see why. The Cleanup tab is used primarily to clean up defects in the screen-backing region only after screen correction adjustments have been exhausted. It's a dangerous tab. So, let's take a look at Cleanup. We'll switch the viewer over to the alpha channel, and we'll zoom in for a closer look. Watch what happens as I enable and disable the Cleanup tab. It has a profound effect on the matte.
I'll enable it so we can take a look at each of the adjustments. The Cleanup slider will clear the noise out of the backing region but at the expense of hardening the edges of the matte. If you lower the cleanup value, you can actually get it back to looking like your original matte. We'll put that back to default. Let's zoom in under one of the mattes here, so we can take a look at the shrink parameter. The shrink slider will actually do an erode in order to shrink the matte. You can see it getting smaller and smaller there. The blur parameter of course does a blur on the matte. There we go.
And the recover sets a threshold below which everything is protected from the cleanup processing. I'll home the viewer so we can see that in action. I'm going to set the recovery slider higher and higher and all the defects start to work back into the picture. So, setting the recover back to 0 means that all the pixels will be processed with the cleanup. We'll set the viewer back to RGB and close by reminding you that the Ultimatte keyer is one of the oldest and most professional keyers in the industry, and does an absolutely brilliant job at blue-screen and green-screen keying.
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