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        <h1>
          Zooming, underscan, and overscan
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<!--#include virtual="contentheader.ssi" -->
        <div xmlns:adobe="http://www.adobe.com/saxon" id="minitoc"><div class="t"><div class="b"><div><ul id="minitoc-links"><li><p><a href="#WS5b3ccc516d4fbf351e63e3d117cbc98bab-7fb1"><h1 class="topictitle1">Zoom the image</h1>
</a></p></li><li><p><a href="#WSE658EB5E-6879-4e95-9384-D88F80FCF146"><h1 class="topictitle1">About underscan and overscan</h1>
</a></p></li></ul></div></div></div></div><div><p>In addition
to zoom settings that reflect traditional underscan and overscan,
the Field Monitor lets you magnify the image up to ten times. At
higher zoom settings, use the scroll bars to navigate to different
image areas.</p>
<ul class="navlinklist"></ul>
</div>
<div id="WS5b3ccc516d4fbf351e63e3d117cbc98bab-7fb1" class="nochunk"><a name="WS5b3ccc516d4fbf351e63e3d117cbc98bab-7fb1"><!-- --></a><h2 class="topictitle2">Zoom the image</h2><div><div class="para"><img src="images/dingbat.png" />&#160;At the bottom of the Field Monitor, select one
of the following from the Zoom Level menu:<dl><dt class="dlterm">Fit</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 full video frame, reflecting the picture visible
on video projectors, wide-screen TVs, and computer monitors. This
zoom setting, which reflects the traditional underscan mode, reveals
content on the edges that DV cameras record but don’t show on their
flip-out LCDs. Look for light stands, microphones, and other unwanted
objects on the edges of the frame. </dd><p class="dlseparator"></p><dt class="dlterm">Overscan</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">Zooms to 90%, reflecting the default safe margin setting
and the area visible on all televisions.</dd><p class="dlseparator"></p><dt class="dlterm">100 to 1,000%</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">Zooms from 1:1 resolution (where each line in the Field Monitor
reflects one line of video) to 10:1 resolution (where each line
is magnified ten times).<div class="note"><span class="notetitle">Note:  </span>Use the 100% setting to accurately
check focus.</div>
</dd><p class="dlseparator"></p></dl>
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<div id="WSE658EB5E-6879-4e95-9384-D88F80FCF146" class="nochunk"><a name="WSE658EB5E-6879-4e95-9384-D88F80FCF146"><!-- --></a><h2 class="topictitle2">About underscan and overscan</h2><div><p>In the early days of television, the on-screen image shrank
as TV sets aged because the electron gun that created the picture
moved more and more poorly. As a result, a black border appeared
around the edges of the picture. The electron gun could be recalibrated
to fill the whole screen, but that was time consuming and costly.
The TV industry settled upon a solution that made the electron guns of
new picture tubes paint the image beyond the borders of the picture
tube. Then, as a TV set aged, more of the image would be visible
rather than black bands appearing.</p>
<p>Although this remedy worked, it created the following problems:</p>
<ul><li><p>The broadcast industry coined the terms <dfn class="term">underscan</dfn> and <dfn class="term">overscan</dfn> and
gave them counterintuitive meanings. Overscan was defined as the
central part of the image that you can see on a standard TV. Underscan
was defined as the full frame, which is visible only on a production
monitor. So the underscan actually shows more of the picture than
the overscan.</p>
</li>
<li><p>The underscan solution frustrates videographers and graphic
designers because the visible area of the frame differs on each
TV set. They must ensure that everything essential to the scene
is visible within the action-safe margin and nothing extraneous
appears in the overscan margin.</p>
</li>
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