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4.2.4.2.
Despill fine
This function is used to eliminate reflections of the keyed background colour in the object. It uses an
algorithm based on chrominance components (elimination of a chrominance component down to 0).
4.2.5.
Edge correction
4.2.5.1.
Edge brightness
This function enables the semi-transparency of picture to be brightened or darkened.
4.3
Luminance keyer functions
4.3.1.
Luminance keyer
4.3.1.1.
Background color (White/Black)
This function enables white or black to be selected as the keyed background colour. The depend-
ence of transparency on the colour distace from keyed colour due to luminance is presented in the
chart below.
Dependence of transparency on the colour distace from keyed colour due to luminance
Drawing 41.
4.3.2.
Matte control
4.3.2.1.
Show alpha matte
This function enables the mask view to be switched on or off; the view is presented in grayscale,
where:
◾
an area fully transparent is black,
◾
an area fully non-transparent is white.
4.3.2.2.
Cut off
This function enables the extension of the range of transparent colours with a luminance close to
that of the reference colour (white or black).
Impact of the Cut off function on the dependence of transparency on the colour distace
Drawing 42.
22
DVK-300HD
1
0
0
1
0
cut off
0
from keyed colour due to luminance
|x|
|x|
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