Checking Gamut
Checking Gamut
Signals that are legal and valid in one signal representation may not be legal in
another representation. Speci
fi
cally, signals which are legal in the Digital YCbCr
representation may not be legal if transcoded to RGB or encoded to NTSC / PAL.
Any signal that fails this test is considered out of gamut.
Adjust Gamut Thresholds from the Con
fi
guration menu. From this same menu,
you can also reset some gamut thresholds to default values.
Your instrument supports multiple displays and alarms to detect out-of-gamut
signals. The
fl
exible, tiled display allows you to simultaneously view several
gamut measurements to learn which is most appropriate for a given application.
The displays are and their uses follow:
Diamond for checking that SDI signals conform to legal RGB gamut space.
Split Diamond separates the upper and lower diamonds to show excursions
below black; otherwise it is identical to the Diamond display.
Arrowhead for checking if an SDI signal is legal for composite color space.
Composite Waveform modes for checking video signals for legality in
composite color space.
Spearhead for showing lightness, color value, and saturation of the RGB
color space.
Diamond, Split Diamond, Arrowhead, and Spearhead have adjustable thresholds.
If the signal goes outside the area de
fi
ned by the thresholds, the signal is out of
gamut. If these limits are exceeded, then the instrument can generate alarms
if con
fi
gured to do so. For composite waveforms, the legal limit is simply the
maximum level allowed for the combination of luma and chroma. This limit
depends on the application. For example, a video tape machine may be able to
record and play out signals with higher luma and chroma components than a
transmitter.
To Set Up Gamut Checks
1.
Connect a video signal to an SDI input on the rear panel.
2.
Select a tile in which to view the Gamut Display and press and hold the
GAMUT
button.
3.
In the Gamut pop-up menu, select from the following gamut display types:
Diamond – Use to detect, isolate, and correct RGB component gamut
errors. (See page 98,
Split Diamond – Use to reveal hard-to-
fi
nd black gamut errors.
WVR5200 Waveform Rasterizer User Manual
97
Summary of Contents for WVR5200 Series
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