Grass Valley DD10 part 1 - Manual (Page 43)

2.7 Keyers Diamond digital DD10
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Thus, the key color Blue influences the following colors:
•
by Selectivity L, the reddish neighboring colors
•
by Selectivity R, the greenish neighboring colors
•
by Selectivity Y, the gray/yellow colors.
Direction of rotation of the controls:
The influence of the foreground is increased when Selectivity L is turned left and
Selectivity R is turned right.
When Selectivity L is at the right stop and Selectivity R is at the left stop, a very
high selectivity (i. e. narrow band color selection) is set.
With Selectivity Y = 50% (center position after automatic run), this parameter is
without influence on the picture. Higher values (cw rotating) deprive gray edges in-
creasingly by the key color, thus coloring them complementarily. A gray halo in yel-
low (blond) hair becomes yellow (blond) again when its gray was effected by mixing
yellow and blue key colors.
Adjustment of the selectivity should be just so much that the key color portion on
the foreground object has disappeared. Doing so, a slight ”keying” of the fore-
ground object may be first put up with.
Selectivity C (Key Color key + Density knob)
Selectivity center refers to the achromatic center of the color circle and acts on the
slightly saturated key colors which cannot be influenced with SEL_R.
Problem: The light blue shirt of a newscaster is slightly transparent after ad-
justment. It could be made dense with DENSITY; however it would
lose its blue color.
Solution: Rotate Selectivity C in cw direction until the shirt is dense.
Then correct possibly obtained blue fringes with SEL–L and SEL–R.
Alternative: For reducing newly occurring blue fringes, first use DENSITY and
then SELECTIVITY C as described above.
The Density control can be used to restore the density of the foreground object.
This may become necessary if the foreground object is slightly ”keyed” (trans-
parent) as a result of blue spill and/or the required selectivity setting.
The Clean up control can be used to ”clean up” the background.
This may become necessary if the background contains noise or undesired shad-
ows etc.
The setting first acts on the brightest key color areas. The interference will deterio-
rate for darker colors that remain uncleaned.
Density
Clean up