Extra Information

Niagara SCX User Guide
ViewCast 35
Tab Description
Gamma
Corrections
• Adjust the gamma of the incoming video.
• Gamma refers to the response curve of video cameras/CRTs.
• When you capture video with a camera, the camera response remains
deliberately nonlinear – it boosts low lumen values and compresses high
lumen values – based on two reasons:
(1) It increases the effective bandwidth in the low lumen range, where you
need it, at the expense of the high lumen range, where you need it less.
(2) It matches the response characteristics of TV sets and monitors.
• 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 list of options.
NOTE: The value represents the inverses of the gamma bias that you
applied at the video source per the video standard so the resulting
video becomes gamma-neutral.
• To enable:
— Check the enable field.
— When the setting equals 1.00, you make the response characteristics
and the bandwidth identical to the original picture.
• Gamma correction applies to all filters and all output pins on each device.
• You can have different gamma corrections for different physical devices.
Tuning Utilities
• Access the Tuning Utilities for a selected card.
• Refer to Chapter 12: Tuning Utilities for additional diagnostics information.
Audio Settings
• Lists the input source options for selected audio devices.
• Makes left and right volume levels available for adjustments if the audio
capture device supports them.