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How do I deal with color spill in chroma key using GIMP?


Question

I'm experimenting with "green screen" techniques to remove the background around a test subject. The test shots were taken in front of a bright green background in moderate to bright lighting conditions. I am using the GIMP "select by color" to try to select and remove the green background.

The issue that I am seeing is that there seems to be a greenish fuzz or color spill around everyone in the photo. The range of brightness is quite wide, so I'm finding I have to select many times in an attempt to get rid of this. Worse still, I am having trouble removing this spill at all when it interacts with light colored hair. When I try to select some of the green, it starts selecting significant portions of the picture that I want to keep, mainly hair.

Is there a way to deal with this problem, or am I doing something wrong?

2013/06/10
1
9
6/10/2013 3:25:00 PM

I would select the edges with a blurred selection and then try to use Color to Alpha with your green screen color. This will remove some detail from the edges though, but it's just what I have occasionally used, someone else may have a better suggestion.

2013/07/01
3
7/1/2013 7:01:00 PM