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Creating an even Green Screen

Updated: Mar 28



Having an uneven green screen may lead to a lot of extra work down the line of a compositing process. Follow these steps to ensure that you start your composite workflow with the cleanest green screen possible.


[Denoise] the footage

  • Sample area for denoise

Use [Keylight] to create a solid core matte. Don't worry about the background.

  • Sample Screen Color

  • Toggle with Screen Balance, Clip White, and Screen Despot Black

[Invert] the footage



From [Denoise], use [IBKColour] to create a solid black object sitting inside the original object

  • Change screen type to green

  • Reduce blur size (start with 5)

  • Analyze the RGB channels and adjust dark and light to create a solid black patch (0.04)

  • erode and patch black till solid black object sits the original






IBKColour

Copy [keylight] and [invert] from above and [divide] the two [invert]

  • The goal is to divide the background to get a solid white

  • Since black= 0 the black object in front is not affected



[Shuffle] the alpha to RGB




RGB

Create negative luminance of the original

  • Create [Constant] from green sample

  • Have the [Constant] [minus] [IBKColour]



[Multiply] with the [Shuffle] to generate a correction plate and [plus] to the original


Final result


Full node graph


https://www.linkedin.com/learning/vfx-keying-master-course/screen-correction-workflow?u=2208146

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