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Using the Screen Matte controls

From: Nuke 6 New Features

Video: Using the Screen Matte controls

Now, let's talk about the Screen Matte menu. This popup menu contains additional controls for refining the screen matte or the key. Clip Black pulls down on the black part of the picture. So, if I click and drag right, you see I am inching this up to the right. It's increasing the contrast though, but just by pulling down on the blacks only. Of course, as you know, I'm losing edge detail as I do that. As I back this in, you can see the edge detail coming back. Restore that to default.

Using the Screen Matte controls

Now, let's talk about the Screen Matte menu. This popup menu contains additional controls for refining the screen matte or the key. Clip Black pulls down on the black part of the picture. So, if I click and drag right, you see I am inching this up to the right. It's increasing the contrast though, but just by pulling down on the blacks only. Of course, as you know, I'm losing edge detail as I do that. As I back this in, you can see the edge detail coming back. Restore that to default.

Clip White pulls up on the whites and you can see that here, as I inch this down, it's making the matte harder and harder in the core. But it's also expanding the core matte into the corners of this fine detail here. If I set that back to default, you can see the effect that has. Clip Rollback is a modifier for the Clip Black and White. I am going to throw in a little bit of Clip Black. You'll notice how it has degraded the edges. But as I adjust Clip Rollback it attempts to restore some of the detail in the blacks.

I'll restore the Clip Black, I'll reset the viewer, and we'll zoom into this area here to show a Clip White Rollback. We'll use this region here to look at the Clip White Rollback. If we look at the green screen, the source, we can see this is supposed to be a semi-transparent region. So, we'll go back to our Screen Matte. If I adjust the Clip White, it starts to fill it in solid, then I can adjust the Clip Rollback to push it back to semi-transparent. Okay, we'll set the Clip Rollback to default as well as the Clip White and rehome the viewer.

Now, let's take a look at Screen Dilate. It does just what you expect. It will do a dilate or an erode on the finished key. So, we can dilate it or erode it. We set that back to default. Screen Softness applies a blur to the finished key. Dilate that in and our key gets softer and softer. Again, this is entirely different than the Screen PreBlur. This applies a blur to the green screen and then the key is pulled on the filtered green screen. This is applying a blur to the finished key.

Next, Screen Despot Black and White. We'll take a look at White first. First, we'll zoom in here to get a close look. So, I've got these white pixels here in the black zone. I might even adjust the Screen Gain to get rid of them. But if I adjust the viewer gamma I can see that they're still there. So, if you want to get rid of the white flecks in the black regions, that's what the Despot White is for. As, we will roll that up, boom! They disappear.

I think it's applying a median filter. We'll reset that back to default, reset the viewer gamma back to default and rehome the viewer. The Screen Despot Black does the same job, but for those black peppery pixels you get inside your solid core, typically from grain. Now, this particular picture doesn't have that problem, so I'm going to introduce it with this and now I've got grain holes all over my core matte. So, I am going to adjust Despot Black and make them go away, okay.

All right, I'll restore Despot Black to default, rehome the viewer, and remove my horrible Black Despot node. The last two items, Screen Replace and Screen Replace Color, we'll take a look at shortly.

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This video is part of

Image for Nuke 6 New Features
Nuke 6 New Features

59 video lessons · 5834 viewers

Steve Wright
Author

 
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  1. 7m 45s
    1. Welcome
      1m 56s
    2. What is NukeX?
      5m 0s
    3. Using the exercise files
      49s
  2. 1h 11m
    1. Learning the interface
      5m 15s
    2. Drawing shapes
      1m 41s
    3. Editing shapes
      5m 1s
    4. Keyframe animation
      6m 4s
    5. Property panel tabs
      7m 8s
    6. The shape list
      4m 26s
    7. Output settings
      1m 11s
    8. Workflow examples
      5m 33s
    9. Creating garbage mattes
      4m 55s
    10. Drawing strokes
      4m 16s
    11. Editing strokes
      4m 30s
    12. The Clone tool
      1m 37s
    13. Editing the Clone tool
      2m 54s
    14. The Reveal tool
      9m 2s
    15. The Blur tool
      2m 21s
    16. The output mask
      2m 57s
    17. The Dodge tool
      2m 32s
  3. 27m 38s
    1. Basic compositing
      3m 51s
    2. Using the Screen controls
      2m 50s
    3. Using the Screen Matte controls
      3m 37s
    4. The Crop feature
      2m 28s
    5. Holdout and garbage mattes
      2m 19s
    6. The Tuning controls
      1m 58s
    7. The Bias controls
      2m 37s
    8. Screen replacement
      2m 15s
    9. Multipass keying
      4m 37s
    10. Color-correcting the foreground
      1m 6s
  4. 17m 8s
    1. Basic setup
      3m 24s
    2. The Ultimatte workflow
      5m 18s
    3. Using the matte tools
      4m 16s
    4. Spill suppression
      4m 10s
  5. 28m 8s
    1. Overview
      2m 42s
    2. Pre-processing the greenscreen
      3m 25s
    3. Creating specialized keys
      7m 14s
    4. The preliminary composite
      6m 14s
    5. Creating supplemental keys
      6m 22s
    6. Alternative workflows
      2m 11s
  6. 24m 39s
    1. Editing control points
      4m 49s
    2. Editing the warp grid
      2m 52s
    3. Keyframe animation
      4m 42s
    4. Morphing
      10m 7s
    5. Additional tabs
      2m 9s
  7. 33m 20s
    1. Drawing splines
      6m 3s
    2. Drawing open splines
      2m 0s
    3. Limiting the warp
      7m 1s
    4. Warping to a target image
      5m 54s
    5. Morphing
      8m 1s
    6. The correspondence points
      4m 21s
  8. 9m 3s
    1. The MotionBlur2D node
      5m 55s
    2. Using the VectorBlur node
      3m 8s
  9. 10m 29s
    1. The ZBlur node
      6m 33s
    2. Image-based blurs
      3m 56s
  10. 11m 13s
    1. Navigating the Dope Sheet
      5m 17s
    2. Shifting keyframes
      5m 56s
  11. 5m 22s
    1. Making a group
      2m 50s
    2. Making a gizmo
      2m 32s

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