Grass Valley Kayenne XL Package v.7.0.4 - Manual (Page 197)

Kayenne XL Package — User Manual 195
Multi Function Control
Automatic Chroma Key Adjustment
The first step of setting up most chroma keys is to use Auto Setup. Auto
Setup automates the first steps to achieving a chroma key. Auto Setup per-
forms the following:
• Calculates primary suppression Hue and Luminance.
• Sets primary suppression Selectivity and Chroma to defaults.
• Calculates Clip Low, and sets Clip Hi to default.
• Sets all the secondary suppression values to duplicate the primary sup-
pression values, but turns secondary suppression off.
• Changes Opacity temporarily to 100% to permit an accurate backing
color sample, and then returns it to its original setting.
• Sets Key Position and Size values to default (0).
Two different Auto Setup algorithms are available, one for well designed
and lighted sets (FGD
Fade off), and the other for more challenging sets (FGD
Fade on). Depending on individual circumstances, additional manual
adjustments may be required after you use Auto Setup.
After an Auto Setup has been initiated by pressing the Curs button, you can
cancel it by pressing the Curs button again, but the chroma key will retain
the default settings imposed.
If the result of the Auto Setup is not satisfactory, further fine tuning can be
made in the chroma key menu as described below:
1. Adjust Selectivity to ensure that no foreground color is affected by the
keying process.
2. If there is still some transparency left, adjust Clip Lo to make the
foreground opaque, and adjust clip Hi to suppress noise/shadows in
the background. To help with this adjustment, turn on Show Key using
the PVW button.
3. Adjust Flre (Flare) suppression if needed, to reduce flare created in the
camera lens.
4. Adjust Foreground (secondary color) suppression if needed, due to
direct reflections in foreground objects.
FGD Fade
If the set is lit unevenly or has other problems, FGD Fade is available to help
solve the problem. A better alternative, if time permits, is to adjust the
lighting on the set to even out the backing color. This may improve the key
so that FGD Fade is not needed.