Grass Valley Kayak HD v.6.9.3 - Manual (Page 107)

Kayak — User Manual 107
DD Mode Keyer Subpanel
The default table entry for Coupled Key is White . For DVEs, character gen-
erators, graphics, etc., the input where the Key signal from such an image
source is connected should be coupled to the input where the video signal
is connected.l
Strategy for Manual Chroma Key Setup.
1. Turn Selectivity to minimum
2. Set Clip Lo/Hi to “midrange values” (we recommend Clip Lo/Hi, but
it is also possible with Clip/Gain)
3. Set primary suppression CHROMA to max.
4. Set Primary suppression LUM to min.
5. Turn primary suppression HUE until the background (the key color)
becomes very noisily affected. Adjust for maximum.
6. Increase the Selectivity until the background is completely keyed off
but foreground stays unaffected.
7. Adjust CHROMA and LUM (primary) so that the background color
and luminance appears as in the original.
8. Adjust Clip Lo/Hi. Adjust Clip Lo to make the foreground opacity and
adjust clip Hi to suppress noise/shadows in the background. To help
with this adjustment, turn on Show Key using the KEY PVW button.
9. If necessary, start tweaking as after and AUTO adjustment
Table 3. Overview Key Selection Mode
Key Selection Mode Indication Operation
Identical Self Key is lit Select Fill and Key source together
Coupled No button lit
Select Fill source and the Coupled Key
input as Key source
Split
Key Split is lit
Key Split is not pressed
Select Fill source
Split
Key Split is lit
Key Split is pressed
Select Key source