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Nuke 5 Essential Training was created and produced by Steve Wright. We are honored to host his material in the lynda.com Online Training Library®.
Nuke 5 Essential Training is designed for digital artists already familiar with compositing visual effects using programs like Adobe After Effects or Shake. This course provides a solid foundation in operating Nuke, using the core functions of keying, motion tracking, and color correcting, as well as Nuke’s key strength, 3D compositing. Tour the Nuke user interface, its unique color management system, and overviews of HDR images, masking, keyframe animation, and 2D and 3D motion blur. Exercise files accompany the course.
Before we get into the Keymix and Addmix nodes, it might be good to take a look at why they are so important. The great delusion is that you can take a Keyer, plug in your green screen and your background, and put out a nice composite. So, here we have a lovely green screen, over here is a nice background and coming out of Primatte is a lovely composite, but this almost never works in the real world. In the real world, you are going to have to composite outside of the Keyer, pulling multiple keys, and that's where the Keymix and Addmix nodes come in.
Over here, represents a more realistic workflow. Let me get a little more space here for this. This represents the green screen, and multiple keyers. Each Keyer will have different settings in order to pull the optimal matte for different parts of the picture, represented here. Then down here, those mattes would be combined to form a single master matte. On a separate branch, the green screen will go to a HueCorrect node for Spill Suppression, or whatever spill suppression capability you have got.
Then after Spill Suppression, it gets ColorCorrection. Then the color corrected and spill suppressed version of the foreground comes into a Keymix node with a master matte that was made over here, and gets composited on to the background. Now there are other organizations than this one. You can pull a key and then do the composite over the background, and pull another key, and then composite on top of that one, and so on and so on, until you have layered up a good composite, but in principle, this is how you are going to be working. And to do the composite, you are going to need to use the Keymix and the Addmix node.
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