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Niagara SCX User Guide
ViewCast 75
Tab Description
The calibration specified in video standards matches the requirements of
cameras and TV sets in broadcast use.
This usually, however, does not match the needs of computer-based
applications or the response curves of computer monitors.
Therefore, you often need a correction inverse to the original bias and you
may want to tune for the characteristics of a particular monitor.
When you disable the gamma correction filters:
Set the gamma correction value to exactly 1.00
The software-based gamma filter works in pass-through mode with no
effect on the video and no processing bandwidth use.
Uncheck the Gamma checkbox
When you enable gamma correction, the text box and graphic show the factor
applied.
If you run preview video while adjusting the filter, you see your adjustment
effects interactively.
You can use one of three methods to adjust the gamma correction value:
(1) Directly enter text in the numeric text box.
(2) Click [+] and [-].
(3) Select Signal field (NTSC, PAL, or SECAM) from the options list.
Gamma correction applies to all filters and all output pins on each device. The
gamma correction can be different for different physical devices.
NOTE: These values represent the inverses of the gamma bias that you applied
at the video source per the video standard so the resulting video becomes
gamma-neutral.
Tuning Utilities
Access the Tuning Utilities option for a selected card.
Shows tuning utilities options for selected devices (Figure 129).
NOTE: Refer to
Chapter 12: Tuning Utilities
for added diagnostics data.
Figure 129. MPEG-4 Tuning Utilities Settings
Audio Settings
Lists the audio input options for selected audio devices.
Makes left and right volume level adjustments available if the audio capture
device supports them.
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