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Correction of object edges and sharpness
3.2
As seen in Drawing 13, an extension of the range by means of the White level function usually
results in the restoration of a uniformly black surface to slight grays.
In this case, in order to adjust the grayness two further functions from the Tolerance correction
section are needed. The first one is called Color and its use leads to the restoration to a uniform
black structure of the background.
The Color slider
Drawing 15.
The other one, Luminance, improves the structure of the uniform colour of the white mask.
The Luminance slider
Drawing 16.
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 Drawings
17 and 18.
A view before a Luminance adjustment
A view after a Luminance adjustment
Drawing 18.
Drawing 17.
Re 1. 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.
DVK-300HD
11
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