Grass Valley DD10 part 1 - Manual (Page 42)

2.7 Keyers Diamond digital DD10
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2.7.7.1 Automatic Chroma Key Adjustment
This mode serves to adjust the following parameters:
•
key color for LUMINANCE, HUE and CHROMA
•
selectivity for SELECTIVITY LEFT and SELECTIVITY RIGHT
The parameters DENSITY, CLEAN UP and SELECTIVITY-CENT are set by default
by the adjustment to max. ccw position (ineffective).
SELECTIVITY is set to center position (i.e. ineffective).
COLOR CAN and NOISE REDuction to ON, P/S/S and SEL MASK to OFF.
Auto Pressing the Auto key starts an automatic key adjustment to Blue.
The picture evaluation includes all those colors which are within an angle range of
+/–30
o around the primary color Blue. Within this range, blue with the highest inten-
sity is detected as key color. Key color and selectivity are thus adjusted.
Cursor Pressing the Cursor key starts an automatic, cursor–assisted key adjustment.
When you press the key, the key fill signal with key color and a cursor appears on
the preview monitor. Move the cursor to a spot of the key color using the trackball
in the Positioner panel.
Then press the Auto key to start the adjustment. Only those colors will be eva-
luated the color angle of which resembles to that which was found within the cursor.
With the condition of this color angle the complete picture is evaluated and the color
with the highest intensity is detected as a key color.
Note: The Auto keys in the Chroma Keyer and the Keyers panels operate in
parallel.
When the Keyer is on, the output signal will be affected during the auto-
matic adjustment.
2.7.7.2 Manual Optimization in case of critical patterns
Selectivity Selectivity L (left), Selectivity R (right) and Selectivity Y enables the user to
change the selectivity manually.
This may be required for the following reasons:
•
The user wants another compromise between color fringe and density of the
foreground object.
•
Size and sharpness of the foreground object were not sufficient.
•
Blue spill has to be removed from the foreground object.
•
The picture only contained the key color and no foreground object.
The selectivity separates the unchanged colors from those without key color com-
ponent. The attributes Left and Right refer to the neighborhood to the key color in
the chromatic circle. Y refers to the luminance dependence of the gray mixed color.