Checking Gamut
On the Diamond d
isplay, monochrome signals appear as vertical lines. Nonlinear
component processing, such as from a gamma corrector that alters white balance,
can cause deviations along the vertical axis.
To isolate gamut bright-ups, try the following:
Use the LINE
SEL button to select individual lines.
Use the PICT display to examine the signal (turn on gamut bright-ups in the
Display Set
tings submenu of the Configuration menu).
Use the Diamond Area or Arrowhead Area settings (found in the Gamut
Threshold
s submenu of the Configuration menu) to specify a percentage of the
image pixels to ignore for gamut violations. The Gamut bright-ups, however,
will continue to indicate all Gamut violations.
Checking Composite Gamut
The Arrowhead gamut display plots luminance (Y) against chrominance (C)
to check if the composite signal adheres to standard gamut. NTSC and PAL
Arrowhead displays (75% Color bars) and indicate s the values of the graticule
lines. The arrowhead shape of the graticule results from overlaying the standard
limit
s for luminance and luminance-plus-peak chrominance. (See Figure 61.)
Figure 61: Arrorwhead gamut display plots
122 WFM8200 and WFM8300 Waveform Monitors
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