Grass Valley DD35 Family v.3.1.5 - Manual (Page 84)

2. Panel Operation DD35 Production Switcher
2 – 50 Operating Instructions – Rev. 16 / 10.2001
When should Luminance Key be used?
The luminance Key is used when the key fill signal is not available on a black back-
ground. A further application for Luminance Key is in the Coupled/Split Key mode
when the key signal does not match with the fill signal with respect to contour (e.g.
DVE key signals with soft border).
A ”linear luminance key” (Lin Key) can be selected by simultaneously pushing the
Add/Lin and Lum/Lin buttons; thus achieving that the maximum possible lumi-
nance value range is completely and ”linearly” reproduced on key signal range, re-
gardless whether these extreme values also occur in the picture.
Actuating the Auto button achieves that the darkest luminance value is reproduced
on KEY=0 and the brightest value on KEY=1.These values can be adjusted with
Clip/Gain or Clean up/Density.
Deviating from the adjustment of Lin and Auto by adjusting Clip and Density a
relatively dark luminance level is declared to be the foreground level, this will be
reproduced as dark edges.
2.7.18 LOCKING THE DIGIPOTS
To protect the actual control adjustments against accidental changes, the digipots
in all keyer groups can be locked.
For locking proceed as follows:
D
Simultaneously press the buttons Up/down in the Mattes group and turn one
of the digipots in a keyers group. The three digipots are locked.
D
For unlocking press a delegation button in the respective group.