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How spill suppression works

How spill suppression works - Nuke Tutorial

From the course: VFX Keying: Master Course

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How spill suppression works

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- [Narrator] The despill operation requires two steps. First, a map of the spill is created that I cleverly named the spill map. Second, the spill map is applied to the green screen with some operation, like subtraction, to remove the spill. Let's take a look at a very simple despill operation, simply taking green minus the red. Let me hook up my sampler node here. We'll open that up, sample the frame. The sampler node cuts a line right across the picture here and plots the RGB values. This over here on the left is the left side of the green-screen. The section in the middle is our character. The section on the right is the right side of the green-screen. We can see that in the backing region, the green is much greater than the red, which is a good green-screen. Notice that the green is lower than the red on the character. This is very important. What I've done is I've set up a simple operation here, where we're going to subtract the green channel from the red channel, and then make a…

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