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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html>
<html lang="en">
<head>
  <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<!-- qdeclarativecameraexposure.cpp -->
  <title>CameraExposure QML Type | Qt Multimedia 5.9</title>
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<body>
<div class="header" id="qtdocheader">
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        <table><tr>
<td >Qt 5.9</td><td ><a href="qtmultimedia-index.html">Qt Multimedia</a></td><td ><a href="qtmultimedia-qmlmodule.html">QML Types</a></td><td >CameraExposure QML Type</td></tr></table><table class="buildversion"><tr>
<td id="buildversion" width="100%" align="right">Qt 5.9.5 Reference Documentation</td>
        </tr></table>
      </div>
    </div>
<div class="content">
<div class="line">
<div class="content mainContent">
<div class="sidebar">
<div class="toc">
<h3><a name="toc">Contents</a></h3>
<ul>
<li class="level1"><a href="#properties">Properties</a></li>
<li class="level1"><a href="#methods">Methods</a></li>
<li class="level1"><a href="#details">Detailed Description</a></li>
</ul>
</div>
<div class="sidebar-content" id="sidebar-content"></div></div>
<h1 class="title">CameraExposure QML Type</h1>
<span class="subtitle"></span>
<!-- $$$CameraExposure-brief -->
<p>An interface for exposure related camera settings. <a href="#details">More...</a></p>
<!-- @@@CameraExposure -->
<div class="table"><table class="alignedsummary">
<tr><td class="memItemLeft rightAlign topAlign"> Import Statement:</td><td class="memItemRight bottomAlign"> import QtMultimedia 5.8</td></tr></table></div><ul>
<li><a href="qml-qtmultimedia-cameraexposure-members.html">List of all members, including inherited members</a></li>
</ul>
<a name="properties"></a>
<h2 id="properties">Properties</h2>
<ul>
<li class="fn"><b><b><a href="qml-qtmultimedia-cameraexposure.html#aperture-prop">aperture</a></b></b> : real</li>
<li class="fn"><b><b><a href="qml-qtmultimedia-cameraexposure.html#exposureCompensation-prop">exposureCompensation</a></b></b> : real</li>
<li class="fn"><b><b><a href="qml-qtmultimedia-cameraexposure.html#exposureMode-prop">exposureMode</a></b></b> : enumeration</li>
<li class="fn"><b><b><a href="qml-qtmultimedia-cameraexposure.html#iso-prop">iso</a></b></b> : int</li>
<li class="fn"><b><b><a href="qml-qtmultimedia-cameraexposure.html#manualAperture-prop">manualAperture</a></b></b> : real</li>
<li class="fn"><b><b><a href="qml-qtmultimedia-cameraexposure.html#manualIso-prop">manualIso</a></b></b> : real</li>
<li class="fn"><b><b><a href="qml-qtmultimedia-cameraexposure.html#manualShutterSpeed-prop">manualShutterSpeed</a></b></b> : real</li>
<li class="fn"><b><b><a href="qml-qtmultimedia-cameraexposure.html#meteringMode-prop">meteringMode</a></b></b> : enumeration</li>
<li class="fn"><b><b><a href="qml-qtmultimedia-cameraexposure.html#shutterSpeed-prop">shutterSpeed</a></b></b> : real</li>
<li class="fn"><b><b><a href="qml-qtmultimedia-cameraexposure.html#spotMeteringPoint-prop">spotMeteringPoint</a></b></b> : QPointF</li>
</ul>
<a name="methods"></a>
<h2 id="methods">Methods</h2>
<ul>
<li class="fn"><b><b><a href="qml-qtmultimedia-cameraexposure.html#setAutoAperture-method">setAutoAperture</a></b></b>()</li>
<li class="fn"><b><b><a href="qml-qtmultimedia-cameraexposure.html#setAutoIsoSensitivity-method">setAutoIsoSensitivity</a></b></b>()</li>
<li class="fn"><b><b><a href="qml-qtmultimedia-cameraexposure.html#setAutoShutterSpeed-method">setAutoShutterSpeed</a></b></b>()</li>
</ul>
<!-- $$$CameraExposure-description -->
<a name="details"></a>
<h2 id="details">Detailed Description</h2>
<p><a href="qml-qtmultimedia-cameraexposure.html">CameraExposure</a> allows you to adjust exposure related settings like aperture and shutter speed, metering and ISO speed.</p>
<p>It should not be constructed separately, instead the <code>exposure</code> property of the a <a href="qml-multimedia.html#camera">Camera</a> should be used.</p>
<pre class="qml">

  <span class="type"><a href="qml-qtmultimedia-camera.html">Camera</a></span> {
      <span class="name">id</span>: <span class="name">camera</span>

      <span class="name">exposure</span>.exposureCompensation: -<span class="number">1.0</span>
      <span class="name">exposure</span>.exposureMode: <span class="name">Camera</span>.<span class="name">ExposurePortrait</span>
  }

</pre>
<p>Several settings have both an automatic and a manual mode. In the automatic modes the camera software itself will decide what a reasonable setting is, but in most cases these settings can be overridden with a specific manual setting.</p>
<p>For example, to select automatic shutter speed selection:</p>
<pre class="cpp">

  camera<span class="operator">.</span>exposure<span class="operator">.</span>setAutoShutterSpeed()

</pre>
<p>Or for a specific shutter speed:</p>
<pre class="cpp">

  camera<span class="operator">.</span>exposure<span class="operator">.</span>manualShutterSpeed <span class="operator">=</span> <span class="number">0.01</span> <span class="comment">// 10ms</span>

</pre>
<p>You can only choose one or the other mode.</p>
<!-- @@@CameraExposure -->
<h2>Property Documentation</h2>
<!-- $$$aperture -->
<div class="qmlitem"><div class="qmlproto">
<div class="table"><table class="qmlname">
<tr valign="top" class="odd" id="aperture-prop">
<td class="tblQmlPropNode"><p>
<a name="aperture-prop"></a><span class="name">aperture</span> : <span class="type">real</span></p></td></tr>
</table></div>
</div><div class="qmldoc"><p>This property holds the current lens aperture as an F number (the ratio of the focal length to effective aperture diameter).</p>
<p><b>See also </b><a href="qml-qtmultimedia-cameraexposure.html#manualAperture-prop">manualAperture</a> and <a href="qml-qtmultimedia-cameraexposure.html#setAutoAperture-method">setAutoAperture()</a>.</p>
</div></div><!-- @@@aperture -->
<br/>
<!-- $$$exposureCompensation -->
<div class="qmlitem"><div class="qmlproto">
<div class="table"><table class="qmlname">
<tr valign="top" class="odd" id="exposureCompensation-prop">
<td class="tblQmlPropNode"><p>
<a name="exposureCompensation-prop"></a><span class="name">exposureCompensation</span> : <span class="type">real</span></p></td></tr>
</table></div>
</div><div class="qmldoc"><p>This property holds the adjustment value for the automatically calculated exposure. The value is in EV units.</p>
</div></div><!-- @@@exposureCompensation -->
<br/>
<!-- $$$exposureMode -->
<div class="qmlitem"><div class="qmlproto">
<div class="table"><table class="qmlname">
<tr valign="top" class="odd" id="exposureMode-prop">
<td class="tblQmlPropNode"><p>
<a name="exposureMode-prop"></a><span class="name">exposureMode</span> : <span class="type">enumeration</span></p></td></tr>
</table></div>
</div><div class="qmldoc"><p>This property holds the camera exposure mode.</p>
<p>The mode can be one of the following:</p>
<div class="table"><table class="generic">
 <thead><tr class="qt-style"><th >Value</th><th >Description</th></tr></thead>
<tr valign="top" class="odd"><td >Camera.ExposureManual</td><td >Manual mode.</td></tr>
<tr valign="top" class="even"><td >Camera.ExposureAuto</td><td >Automatic mode.</td></tr>
<tr valign="top" class="odd"><td >Camera.ExposureNight</td><td >Night mode.</td></tr>
<tr valign="top" class="even"><td >Camera.ExposureBacklight</td><td >Backlight exposure mode.</td></tr>
<tr valign="top" class="odd"><td >Camera.ExposureSpotlight</td><td >Spotlight exposure mode.</td></tr>
<tr valign="top" class="even"><td >Camera.ExposureSports</td><td >Spots exposure mode.</td></tr>
<tr valign="top" class="odd"><td >Camera.ExposureSnow</td><td >Snow exposure mode.</td></tr>
<tr valign="top" class="even"><td >Camera.ExposureBeach</td><td >Beach exposure mode.</td></tr>
<tr valign="top" class="odd"><td >Camera.ExposureLargeAperture</td><td >Use larger aperture with small depth of field.</td></tr>
<tr valign="top" class="even"><td >Camera.ExposureSmallAperture</td><td >Use smaller aperture.</td></tr>
<tr valign="top" class="odd"><td >Camera.ExposurePortrait</td><td >Portrait exposure mode.</td></tr>
<tr valign="top" class="even"><td >Camera.ExposureAction</td><td >Action exposure mode. Since 5.5</td></tr>
<tr valign="top" class="odd"><td >Camera.ExposureLandscape</td><td >Landscape exposure mode. Since 5.5</td></tr>
<tr valign="top" class="even"><td >Camera.ExposureNightPortrait</td><td >Night portrait exposure mode. Since 5.5</td></tr>
<tr valign="top" class="odd"><td >Camera.ExposureTheatre</td><td >Theatre exposure mode. Since 5.5</td></tr>
<tr valign="top" class="even"><td >Camera.ExposureSunset</td><td >Sunset exposure mode. Since 5.5</td></tr>
<tr valign="top" class="odd"><td >Camera.ExposureSteadyPhoto</td><td >Steady photo exposure mode. Since 5.5</td></tr>
<tr valign="top" class="even"><td >Camera.ExposureFireworks</td><td >Fireworks exposure mode. Since 5.5</td></tr>
<tr valign="top" class="odd"><td >Camera.ExposureParty</td><td >Party exposure mode. Since 5.5</td></tr>
<tr valign="top" class="even"><td >Camera.ExposureCandlelight</td><td >Candlelight exposure mode. Since 5.5</td></tr>
<tr valign="top" class="odd"><td >Camera.ExposureBarcode</td><td >Barcode exposure mode. Since 5.5</td></tr>
<tr valign="top" class="even"><td >Camera.ExposureModeVendor</td><td >The base value for device specific exposure modes.</td></tr>
</table></div>
</div></div><!-- @@@exposureMode -->
<br/>
<!-- $$$iso -->
<div class="qmlitem"><div class="qmlproto">
<div class="table"><table class="qmlname">
<tr valign="top" class="odd" id="iso-prop">
<td class="tblQmlPropNode"><p>
<a name="iso-prop"></a><span class="name">iso</span> : <span class="type">int</span></p></td></tr>
</table></div>
</div><div class="qmldoc"><p>This property holds the sensor's ISO sensitivity value.</p>
</div></div><!-- @@@iso -->
<br/>
<!-- $$$manualAperture -->
<div class="qmlitem"><div class="qmlproto">
<div class="table"><table class="qmlname">
<tr valign="top" class="odd" id="manualAperture-prop">
<td class="tblQmlPropNode"><p>
<a name="manualAperture-prop"></a><span class="name">manualAperture</span> : <span class="type">real</span></p></td></tr>
</table></div>
</div><div class="qmldoc"><p>This property holds the aperture (F number) value for capturing photos.</p>
<p>If the value is less than zero, the camera automatically determines an appropriate aperture value.</p>
<p><a href="qml-qtmultimedia-cameraexposure.html#aperture-prop">aperture</a>, <a href="qml-qtmultimedia-cameraexposure.html#setAutoAperture-method">setAutoAperture()</a></p>
</div></div><!-- @@@manualAperture -->
<br/>
<!-- $$$manualIso -->
<div class="qmlitem"><div class="qmlproto">
<div class="table"><table class="qmlname">
<tr valign="top" class="odd" id="manualIso-prop">
<td class="tblQmlPropNode"><p>
<a name="manualIso-prop"></a><span class="name">manualIso</span> : <span class="type">real</span></p></td></tr>
</table></div>
</div><div class="qmldoc"><p>This property holds the ISO settings for capturing photos.</p>
<p>If a negative value is specified, the camera will automatically determine an appropriate value.</p>
<p><b>See also </b><a href="qml-qtmultimedia-cameraexposure.html#iso-prop">iso</a> and <a href="qml-qtmultimedia-cameraexposure.html#setAutoIsoSensitivity-method">setAutoIsoSensitivity()</a>.</p>
</div></div><!-- @@@manualIso -->
<br/>
<!-- $$$manualShutterSpeed -->
<div class="qmlitem"><div class="qmlproto">
<div class="table"><table class="qmlname">
<tr valign="top" class="odd" id="manualShutterSpeed-prop">
<td class="tblQmlPropNode"><p>
<a name="manualShutterSpeed-prop"></a><span class="name">manualShutterSpeed</span> : <span class="type">real</span></p></td></tr>
</table></div>
</div><div class="qmldoc"><p>This property holds the shutter speed value (in seconds). If the value is less than zero, the camera automatically determines an appropriate shutter speed.</p>
<p><a href="qml-qtmultimedia-cameraexposure.html#shutterSpeed-prop">shutterSpeed</a>, <a href="qml-qtmultimedia-cameraexposure.html#setAutoShutterSpeed-method">setAutoShutterSpeed()</a></p>
</div></div><!-- @@@manualShutterSpeed -->
<br/>
<!-- $$$meteringMode -->
<div class="qmlitem"><div class="qmlproto">
<div class="table"><table class="qmlname">
<tr valign="top" class="odd" id="meteringMode-prop">
<td class="tblQmlPropNode"><p>
<a name="meteringMode-prop"></a><span class="name">meteringMode</span> : <span class="type">enumeration</span></p></td></tr>
</table></div>
</div><div class="qmldoc"><p>This property holds the camera metering mode (how exposure is balanced).</p>
<p>The mode can be one of the following:</p>
<div class="table"><table class="generic">
 <thead><tr class="qt-style"><th >Value</th><th >Description</th></tr></thead>
<tr valign="top" class="odd"><td >Camera.MeteringMatrix</td><td >A matrix of sample points is used to measure exposure.</td></tr>
<tr valign="top" class="even"><td >Camera.MeteringAverage</td><td >An average is used to measure exposure.</td></tr>
<tr valign="top" class="odd"><td >Camera.MeteringSpot</td><td >A specific location (<a href="qml-qtmultimedia-cameraexposure.html#spotMeteringPoint-prop">spotMeteringPoint</a>) is used to measure exposure.</td></tr>
</table></div>
</div></div><!-- @@@meteringMode -->
<br/>
<!-- $$$shutterSpeed -->
<div class="qmlitem"><div class="qmlproto">
<div class="table"><table class="qmlname">
<tr valign="top" class="odd" id="shutterSpeed-prop">
<td class="tblQmlPropNode"><p>
<a name="shutterSpeed-prop"></a><span class="name">shutterSpeed</span> : <span class="type">real</span></p></td></tr>
</table></div>
</div><div class="qmldoc"><p>This property holds the camera's current shutter speed value in seconds. To affect the shutter speed you can use the <a href="qml-qtmultimedia-cameraexposure.html#manualShutterSpeed-prop">manualShutterSpeed</a> property and <a href="qml-qtmultimedia-cameraexposure.html#setAutoShutterSpeed-method">setAutoShutterSpeed()</a>.</p>
</div></div><!-- @@@shutterSpeed -->
<br/>
<!-- $$$spotMeteringPoint -->
<div class="qmlitem"><div class="qmlproto">
<div class="table"><table class="qmlname">
<tr valign="top" class="odd" id="spotMeteringPoint-prop">
<td class="tblQmlPropNode"><p>
<a name="spotMeteringPoint-prop"></a><span class="name">spotMeteringPoint</span> : <span class="type">QPointF</span></p></td></tr>
</table></div>
</div><div class="qmldoc"><p>The property holds the frame coordinates of the point to use for exposure metering. This point is only used in spot metering mode, and it typically defaults to the center <code>(0.5, 0.5)</code>.</p>
</div></div><!-- @@@spotMeteringPoint -->
<br/>
<h2>Method Documentation</h2>
<!-- $$$setAutoAperture -->
<div class="qmlitem"><div class="qmlproto">
<div class="table"><table class="qmlname">
<tr valign="top" class="odd" id="setAutoAperture-method">
<td class="tblQmlFuncNode"><p>
<a name="setAutoAperture-method"></a><span class="name">setAutoAperture</span>()</p></td></tr>
</table></div>
</div><div class="qmldoc"><p>Turn on auto aperture selection. The manual aperture value is reset to -1.0</p>
</div></div><!-- @@@setAutoAperture -->
<br/>
<!-- $$$setAutoIsoSensitivity -->
<div class="qmlitem"><div class="qmlproto">
<div class="table"><table class="qmlname">
<tr valign="top" class="odd" id="setAutoIsoSensitivity-method">
<td class="tblQmlFuncNode"><p>
<a name="setAutoIsoSensitivity-method"></a><span class="name">setAutoIsoSensitivity</span>()</p></td></tr>
</table></div>
</div><div class="qmldoc"><p>Turn on auto ISO sensitivity selection. The manual ISO value is reset to -1.</p>
</div></div><!-- @@@setAutoIsoSensitivity -->
<br/>
<!-- $$$setAutoShutterSpeed -->
<div class="qmlitem"><div class="qmlproto">
<div class="table"><table class="qmlname">
<tr valign="top" class="odd" id="setAutoShutterSpeed-method">
<td class="tblQmlFuncNode"><p>
<a name="setAutoShutterSpeed-method"></a><span class="name">setAutoShutterSpeed</span>()</p></td></tr>
</table></div>
</div><div class="qmldoc"><p>Turn on auto shutter speed selection. The manual shutter speed value is reset to -1.0</p>
</div></div><!-- @@@setAutoShutterSpeed -->
<br/>
        </div>
       </div>
   </div>
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