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          Evaluating brightness and color with histograms
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        <div><p>Histograms analyze
the entire image and count the number of pixels at each brightness
or color value. The value that has the most pixels appears as a
spike that reaches all the way to the top of the graph. All other
values are relative to that peak. For example, if a given value
reaches the 40 line, there are 40% as many pixels at that value
as there are at the peak. </p>
<p>The vertical dimension of the scale represents the relative number
of pixels at each brightness value. The horizontal dimension represents
the brightness scale, from dark on the left to bright on the right.</p>
<div class="tip"><img src="images/tip_help.png" />If you’re familiar with Adobe® Photoshop®, the Levels view displays a similar histogram.</div><div class="section"><h4 class="sectiontitle">Display histograms</h4><p>You can display multiple
histograms, each measuring a different color component.</p>
<ul><li><p>To add a new histogram, choose Window&#160;&gt; Histogram&#160;&gt;
New Histogram.</p>
</li>
<li><p>To display an existing histogram, choose Window&#160;&gt;
Histogram&#160;&gt; <var class="varname">[color component]</var>.</p>
</li>
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<div class="section"><h4 class="sectiontitle">Select the color component you want to evaluate</h4><p>In
the upper-right corner of the Histogram panel, click the menu button&#160;<img src="images/panel_menu_icon.png" /> to select
from the following options:</p>
<dl><dt class="dlterm">YCbCr: Y</dt>
<dd xmlns:fn="http://www.w3.org/2005/xpath-functions" xmlns:fo="http://www.w3.org/1999/XSL/Format" xmlns:xs="http://www.w3.org/2001/XMLSchema">Displays overall brightness values.</dd><p class="dlseparator"></p><dt class="dlterm">RGB options</dt>
<dd xmlns:fn="http://www.w3.org/2005/xpath-functions" xmlns:fo="http://www.w3.org/1999/XSL/Format" xmlns:xs="http://www.w3.org/2001/XMLSchema">Displays the Red, Green, or Blue channels individually, or
together with the Parade option.</dd><p class="dlseparator"></p></dl>
</div>
<div class="section"><h4 class="sectiontitle">Adjust intensity and illumination for your working environment</h4><p>To better evaluate video data in a variety
of lighting conditions, adjust the following settings:</p>
<dl><dt class="dlterm">Intensity</dt>
<dd xmlns:fn="http://www.w3.org/2005/xpath-functions" xmlns:fo="http://www.w3.org/1999/XSL/Format" xmlns:xs="http://www.w3.org/2001/XMLSchema">Controls the brightness of the histogram display.</dd><p class="dlseparator"></p><dt class="dlterm">Illumination</dt>
<dd xmlns:fn="http://www.w3.org/2005/xpath-functions" xmlns:fo="http://www.w3.org/1999/XSL/Format" xmlns:xs="http://www.w3.org/2001/XMLSchema">Controls the brightness of the scale.</dd><p class="dlseparator"></p></dl>
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