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The second function is called Color and its use leads to the restoration to a uniform black
structure of the background.
It improves in particular the visibility of an object in the case of a significant difference in
luminance between the background and the object. This means that semi-transparent objects,
e.g. a glass or glasses, become more distinct. A view 'before' and 'after' an adjustment is
presented in the two pictures below.
A view 'before' and 'after'
A view before a Luminance adjustment
A view after a Luminance adjustment
The Color function is also used to bring about another effect. Once the option Show alpha matte
is switched off and the real picture is restored, it is possible to eliminate unnatural outlines. This
can be done by improving the border value between the keyed colour and the object.
A view before a Color adjustment
A view after a Color adjustment
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