Fixing the mask

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    Fixing the mask

    With a few quick steps, we can fix the mask. The information is there; we just need to pull it out. Layer masks are simply greyscale images that can be adjusted like any color photo with Levels or Curves. To see the mask directly while you are working on it, OPT (Mac)/ALT (PC) + click on its thumbnail. Since these kinds of adjustments are pretty simple, use a Levels adjustment. The histogram shows where the dark and light values are. The mask needs to be mostly pure black and pure white with some greys for anti-aliasing. You can either drag the sliders inward manually or use the eyedroppers. Choose the white eyedropper and click in the mask in areas that aren't quite white but should be. Choose the black eyedropper and click in the dark areas that aren't quite black but should be. The trick here is to get enough black and white, but not lose the detail around the hair which comes from the greys and fine detail in the mask. It's a trick because in keeping this detail, a lot of green from the background still comes through.  Add a solid color layer behind the masked image to get a better idea of your edge quality. If you don't know what the new background will be, use 50% grey as I have done here. As you can see, soft edges like hair pose the greatest challenge. This is compounded by what is called 'spill,' where light bounces off the greenscreen and illuminates the edges of the subject. For good greenscreen extraction, we need to remove spill as well. That will be covered in the next tutorial.


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