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If I have a person shot against a blue screen, how can I extract the person to put in front of other background?
The simplest solution would be to use magic wand to select the blue background, inverse, then copy the person.
However, there is a problem at the boundaries. Let’s say this person is wearing white clothing. At the boundary of the white clothing and the blue background, some pixels are a mixture of white and blue color. If these pixels are included, there will be a faint ring of blue color around the person. If these pixels are excluded, let’s say by contracting the selection, then part of the person is lost. Even if I feather the selection, this problem still exists.
What is the solution?
The simplest solution would be to use magic wand to select the blue background, inverse, then copy the person.
However, there is a problem at the boundaries. Let’s say this person is wearing white clothing. At the boundary of the white clothing and the blue background, some pixels are a mixture of white and blue color. If these pixels are included, there will be a faint ring of blue color around the person. If these pixels are excluded, let’s say by contracting the selection, then part of the person is lost. Even if I feather the selection, this problem still exists.
What is the solution?
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