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Now we can take a look at the Screen Replace functions in Keylight right here. The purpose of this is whenever the matte is processed, it can introduce edge discolorations, and this is designed to address that. Let's take a look at how it works. Let's go to the View and punch-up the Status Display. You notice that we see the typical status, pure white, pure black, and some grey pixels. However, when I turn on the Inside Mask, I get these blue pixels here.
This is Keylight telling me that these pixels were affected by the inside mask. Next, we will turn on the Outside Mask and those are turned red. That identifies them as being affected by the Outside Mask. Last, I will adjust the Screen Dilate and look what happens here. I get these green pixels. This is Keylight telling you that these edges have been affected by a Screen Dilate operation and now there is discoloration. This is what we're going to fix with the Screen Replace function right here.
We will switch the view to Composite, and we can see the hideous edge. Of course, this is grossly exaggerated for purposes of making a point. You would never dilate your screen that much. So those pixels that were marked in green are now going to be affected by whatever we do here in the Screen Replace. First of all, under the Screen Replace pop-up we have several choices. Take No Action, which means you are getting the de-spilled foreground here, which of course outside the character is going to be black.
Use the source image, of course the original green screen, or use a Hard Color. Now, if you select Hard Color, you are going to get this color here. Of course we can then turn on the Eyedropper, and select any color we want from anywhere in the picture. But the Hard Color gives you a solid color without any difference to the background whatsoever. If you select Soft Color then whatever color you pick here will be blended with the background based on its luminance.
Keylight supports multi-pass keying, which we will learn about in the next video.
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