Reducing Green Spill

Reducing Green Spill is Easy!

You can dramatically reduce the green spill and color cast in your images by simply optimizing the green screen and green floor size. Most people use too large of a green screen and green floor. This causes a lot of extra green light being reflected onto the person. By simply reducing the surface area and placing the person in the proper location, you can eliminate most of the green spill and color cast. In particular, having a green floor in front of the person is the most problematic setup issue that causes green spill. The floor will bounce green light onto the front of the person.

Green Screen Setup Guidelines

Spill Comparison – Large vs. Small Green Screen Setups

The following simulation were done using 3D rendering software as shown in the video. The reason for this is to be able to easy change the settings to show how spill reacts with different screen configurations. Also, this allowed me to use solid white for the entire person. White is “worst case” for green spill and color cast issues so this was a way to really show the effects. The Blender 3D software can be used for photo realistic rendering and the lighting closely mimics real world lighting. Even thoug these are “cartoon” renders, the green spill shown closely represent real world green screen photography.

Extraction Comparisons - WITHOUT spill correction

Article written by: Damon Bell

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