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This is a picture of a green field that changes into a hill.

The idea is can you can have a large, organic 3D green-screen this way?

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I used a program to normalize the darker green areas of the field using replace color and increasing the thresh hold without losing texture and wonder if this could be done to a live feed?

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It's doable, so long as you have some time, diddling around in After Effects with the Keylight chromakey and the camera tracker... Here's an example I made a while back at 4m25,5m17, 6m04, 8m33 (and a few other sections):

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  • Ye, this looks like the same method used to mark imaginary lines on a football field. – Justintimeforfun May 25 at 16:38
  • I should add - a bit of key-framed masking and possibly a little rotoscoping was also used to improve the overall key effect in some of the shots – tomh May 26 at 8:58
  • Would this work in a horizontal setup? In the example the image is looking down at the grass. Ideally, in my picture the grass, also works as a back drop. – Justintimeforfun May 28 at 22:04
  • So, while you can, use grass as a greenscreen, it won't make a good greenscreen. The idea with a greenscreen is to get the screen to be as uniform as possible; ideally, the whole screen would have the exact same color value at every point, and ALSO, the talent would be placed as far away from the screen as possible, to keep green light from "spilling" onto their skin/hair/clothes,etc. Standing on your screen makes this difficult. Don't expect one-click results if you use grass, and expect to do a lot of rotoscoping and cleanup. Pro screen lighting gets you closer, initially. – Jason Conrad May 29 at 5:04
  • @JasonConrad what if I used a program to make it usable. I added a 2nd picture for an example. – Justintimeforfun May 30 at 5:05

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