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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®.
Tuning is the process of adjusting the matte density individually for the shadow, midtones and highlight regions of the image. I have made a special tuning test diagram here and the shadows are the foreground shadows which should be in this dark area down here, midtones around 0.18 or 0.2, and highlights up here. So the numbers here are designed to show us the brightness of the foreground elements while we are looking at our matte. So we will unfold the Tuning menu here and here are three adjustments for the shadows, midtones, and highlights.
Now the definition of what a midtone is, is set right here. The default 0.5 needs to be changed for Nuke to 0.18, because 0.18 is a 50% gray in Nuke's linear light space. If you had a very dark scene, you might move the Midtones value down a little bit lower and if you had a very bright scene, you might adjust it up a bit. But for the most part, a properly exposed scene, set the midtones at 0.18. Now we will pull a key, Shift+Alt+ Command, and now I will set the Viewer to show us the Screen Matte.
I will come up to the Shadow Gain and if I increase the Shadow Gain, you can see the effect that it has on the matte. I want to toggle that on and off, so you can see the range that is affected. I adjust the Midtones Gains up and you can see it's affected a completely different part of the matte. I will toggle that on and off, because it's affecting just the midtowns, and then I will set the Highlight Gain up here and toggle that on and off so you can see the range affected there.
So you can use the tuning controls of Keylight to set the matte density separately in the shadows, midtones and highlights. Next, we will take a look at the Bias controls.
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