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        <h1>
          Preview different aspect ratios
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        <div><p>Use
the Letterbox Mask option to preview how a video frame looks when
it is cropped to different aspect ratios. The mask appears either
above and below the image, or on the sides. The position of the
mask depends on how the mask’s aspect ratio relates to the current
video aspect ratio.</p>
<div class="note"><span class="notetitle">Note:  </span>Letterbox Mask simply crops the image to provide a preview.
To stretch or squish the image and display it in different proportions,
change the monitor aspect ratio. (See <a href="WS5b3ccc516d4fbf351e63e3d117cbc98bab-7ffc.html">Set the monitor aspect ratio</a>.) </div>
<div 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" class="fignone"><img alt="" id="cf_setup_LetterboxUnderscan" src="images/cf_setup_LetterboxUnderscan.png" /><div class="figdesc">Mask at top and bottom of frame previews different aspect
ratios</div><br /></div><ol><li><p>In the upper-right corner of the Field Monitor, click
the panel menu icon <img src="images/panel_menu_icon.png" />, and
choose Monitor Settings.</p>
</li>
<li><p>In the Letterbox section, select Enable.</p>
</li>
<li><p>For Mode, choose one of the following:</p>
<dl><dt class="dlterm">Shadow</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 a semitransparent gray filter.</dd><p class="dlseparator"></p><dt class="dlterm">Black</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 opaque black bars.</dd><p class="dlseparator"></p><dt class="dlterm">White</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 opaque white bands.</dd><p class="dlseparator"></p></dl>
</li>
<li><p>Select an aspect ratio:</p>
<dl><dt class="dlterm">4:3</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">Specifies the aspect ratio used by conventional television.</dd><p class="dlseparator"></p><dt class="dlterm">16:9</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">Specifies the aspect ratio used by high-definition television
(HDTV).</dd><p class="dlseparator"></p><dt class="dlterm">Anamorphic 2.39</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">Specifies the aspect ratio as the standard cinema aspect ratio.</dd><p class="dlseparator"></p><dt class="dlterm">Custom</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">You can set a ratio ranging from 1.000 (1:1, a square) to
2.400 (12:5).</dd><p class="dlseparator"></p></dl>
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