Knee; Knee (In Powercurves Mode) - GRASS VALLEY LDX FLEX User Manual

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.

5.5.1 Knee (in PowerCurves mode)

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Note Note
PowerCurves mode is not available in the LDX Flex version.
Limit Out
Knee can be set up as an automatic or variable function. It can also be switched off, which is
the default setting.
OCP
Press the KNEE button. The KNEE SEL item is shown. Use this item to select Auto, Var or Off.
CAM
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 to 50% and Max In is set to 400%. The Limit Out can still
be adjusted between 100% and 118%. The circuitry automatically fades between the fixed
Knee curve and the linear curve.
Variable Knee
The following parameters in the Knee menu can be used to set up variable Knee in
PowerCurves mode:
• Kn Point/Point (0% to 90%): this is the video input level from which Knee starts
compressing.
• Kn OutLim/Limit Out (100% to 118%): the highest video level that is produced at the video
output.
• Kn Max In/Max In (100% to 800%): the maximum allowed video input level.
LDX Series Software Upgradable Camera Platform User's Guide (v3.1)
150%
100%
Linear Curve
Knee Curve
50%
0.0
0% 100% 200% 300%
Point
400% 500% 600% 700%
Max In
Input
Chapter 5 - Video setup
800%
65