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        <h1>
          Maintaining consistent color for background keying
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        <div><p>When
you shoot footage against a colored background that will be keyed
out in postproduction, use the Vectorscope and Waveform Monitor
to ensure consistent results. The goal is to maximize the purity
and saturation of the background as much as possible, without negatively
impacting the foreground subject.</p>
<ul><li><p>The Vectorscope assesses the consistency and saturation
of the background color. With nothing in front of the background,
look for a tight signal concentrated out near the target for the
color of the background. The tighter the signal, the more consistent
the background. The farther the signal is from the center of the
scope, the more saturated it is.</p>
</li>
<li><p>The Waveform Monitor assesses the consistency of the brightness
across the background. An ideally lit background shows a thin, straight
line across the graph.</p>
</li>
</ul>
<p>If you are continuing a previous shoot, use these tools to ensure
that the color balance and brightness of the background hasn’t changed
significantly. Confirming background consistency saves time in the
editing application, letting you use the same keying settings for
all clips.</p>
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