GRASS VALLEY Focus 70 Live, Руководство пользователя

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60 Focus 70 Live Highly Affordable HD System Camera User’s Guide (v1.1)
Chapter 5 - Video setup
5.5 Knee
Knee is a function that compresses the wide dynamic range of the video signal coming from
the imager into the more limited video output range.
Knee can be set up as an automatic or variable function. It can also be switched off, which is
the default setting.
Press the KNEE button. The
KNEE SEL
item is shown. Use this item to select Auto, Var or Off.
In the camera menu, navigate to the
CREATIVE CONTROL > LEVELS > KNEE > KNEE
item and
select Auto, Var or Off.
Auto Knee
In Auto Knee, the Knee Point is fixed while slope automatically adjusted achieve the best
possible Knee compression.
Variable Knee
The following parameters in the Knee menu can be used to set up variable Knee in
Compatibility mode:
• Kn Point/Point M (0 to 99): this is the video input level from which Knee starts
compressing.
• Kn Slope/Slope M (0 to 99): determines how much compression is applied above the Knee
point.
• Knee Limit (0 to 99): the maximum allowed video input level.
5.6 Optical ND filters
A Neutral Density filter (ND) can be placed in the path of the optical signal to modify the
incoming light. ND filters can be used, for example, to control depth of field or exposure levels.
100% 200% 300% 400% 500% 600% 700% 800% 0%
0.0
100%
150%
50%
Slope (+)
Input
Output
Slope (-)
Point
Knee Curve
Linear Curve
OCP
CAM