Ops 4–26 • Switcher Basics Vision Operator’s Manual (v12.0 MD)
Color Correction
Color correction in the Vision switcher is performed by either Processing Amplifiers (Proc
Amps) in the HSL (Y-Cr-Cb) color space or by RBG Color Correctors in the RBG color space.
Both Proc Amps and RGB Color Correctors allow you to apply color correction to video sources
on the fly to input video signals, entire buses, or Aux Bus outputs.
• Input-Based Correction — This type of color correction is applied to the video input
regardless of which MLE or Aux Bus it is selected on. Input-based color correction is not
stored in switcher memories.
• Bus-Based Correction — This type of color correction is applied to the output of the
assigned bus. Unlike the input-based color correction, bus-based color correction is
stored and recalled with memories. This allows you to include a color correction element
as part of an effects dissolve.
• Aux Bus Correction — This type of color correction is applied to the output of an Aux
Bus, but can only be applied to a limited number of Aux Buses. You must have an MLE
for each Aux Bus that you want to apply a color corrector to. If you have 4 MLEs, you
can only color correct 4 Aux Buses. Like input-based color correction, Aux Bus color
correction is not stored in switcher memories.
Color correction is additive, allowing you to apply any combination of Proc Amp and RGB Color
Corrector based adjustment to a video signal on the input, as well as on the bus. If multiple color
corrections are applied, the input-based correction is applied first, and the bus-based correction is
applied after that.
For More Information...
• on Aux Bus color correction, refer to the section “Aux Bus Color Correction” on
page Ops 4-32.
• on the principles behind color correction, refer to the section “Color Correction
Overview” on page Ops 19-2.
• on memory recalls, refer to the section “Storing and Recalling Memories” on page Ops
8-6.
• on the Proc Amp or RGB Color Corrector software option, refer to the section
“Installing Software Options” on page Eng 6-16.
Proc Amp Color Correction
The Proc Amp video correction allows you to adjust the gain, offset, black level, and gamma of
the video signal.
Use the following procedure to apply color correction to a video signal using a Proc Amp:
1. Double-press the crosspoint button for the video source, or bus, that you want to apply
the Proc Amp to. The current selection is displayed in the upper left corner of the menu.
2. Select the type of Proc Amp video correction you want to apply as follows:
Note — Both the Input Proc Amp Mode Menu and Bus Proc Amp Mode Menu work the
same. The rest of this procedure shows the Input Proc Amp Mode Menu, but the procedures
apply to both.
• Input Proc Amp — Select this option to perform an input-based color correction.
The Input BNC that is displayed on the menu is used. The Proc Amp Input Mode
Menu is displayed.
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