From the course: VFX Keying: Master Course

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Keying on saturation

Keying on saturation - Nuke Tutorial

From the course: VFX Keying: Master Course

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Keying on saturation

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- [Instructor] While an object you want to isolate might share the same hue and brightness with other objects in the frame, it might be separable based on its saturation. Here, we will see how the saturation keyer works, where to find it, and how it might be used to isolate an object for special processing. Once again, I have my color wheel up here, and as you know, out here on the furthest rim, the saturation is one point oh, and you can see that right down there, and as you move into the center, the saturation drops to zero. So, where will we find the saturation keyer? Well, let's come over here to the keyer tab, and get the keyer node. It's buried inside the keyer node. There we are. So, we'll turn around and set this for saturation key. Now, we know that the saturation goes from zero to one, from the center put to the perimeter, so if we check the alpha channel, we'll find that the saturation keyer has made an alpha channel that goes from zero to one. How do we know where to set…

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