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<title>Desaturate QML Type | Qt Graphical Effects 5.5</title>
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<li>Qt 5.5</li>
<li><a href="qtgraphicaleffects-index.html">Qt Graphical Effects</a></li>
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<li class="level1"><a href="#properties">Properties</a></li>
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<li class="level2"><a href="#example">Example</a></li>
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<h1 class="title">Desaturate QML Type</h1>
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<p>Reduces the saturation of the colors. <a href="#details">More...</a></p>
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<div class="table"><table class="alignedsummary">
<tr><td class="memItemLeft rightAlign topAlign"> Import Statement:</td><td class="memItemRight bottomAlign"> import QtGraphicalEffects 1.0</td></tr><tr><td class="memItemLeft rightAlign topAlign"> Since:</td><td class="memItemRight bottomAlign"> QtGraphicalEffects 1.0</td></tr><tr><td class="memItemLeft rightAlign topAlign"> Inherits:</td><td class="memItemRight bottomAlign"> <p><a href="../qtquick/qml-qtquick-item.html">Item</a></p>
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<li><a href="qml-qtgraphicaleffects-desaturate-members.html">List of all members, including inherited members</a></li>
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<h2 id="properties">Properties</h2>
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<li class="fn"><b><b><a href="qml-qtgraphicaleffects-desaturate.html#cached-prop">cached</a></b></b> : bool</li>
<li class="fn"><b><b><a href="qml-qtgraphicaleffects-desaturate.html#desaturation-prop">desaturation</a></b></b> : real</li>
<li class="fn"><b><b><a href="qml-qtgraphicaleffects-desaturate.html#source-prop">source</a></b></b> : variant</li>
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<h2 id="details">Detailed Description</h2>
</p>
<p>Desaturated pixel values are calculated as averages of the original RGB component values of the source item.</p>
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<thead><tr class="qt-style"><th >Source</th><th >Effect applied</th></tr></thead>
<tr valign="top" class="odd"><td ><p class="centerAlign"><img src="images/Original_bug.png" alt="" /></p></td><td ><p class="centerAlign"><img src="images/Desaturate_bug.png" alt="" /></p></td></tr>
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<h2 id="example">Example</h2>
<p>The following example shows how to apply the effect.</p>
<pre class="qml">import QtQuick 2.0
import QtGraphicalEffects 1.0
<span class="type"><a href="../qtquick/qml-qtquick-item.html">Item</a></span> {
<span class="name">width</span>: <span class="number">300</span>
<span class="name">height</span>: <span class="number">300</span>
<span class="type"><a href="../qtquick/qml-qtquick-image.html">Image</a></span> {
<span class="name">id</span>: <span class="name">bug</span>
<span class="name">source</span>: <span class="string">"images/bug.jpg"</span>
<span class="name">sourceSize</span>: <span class="name">Qt</span>.<span class="name">size</span>(<span class="name">parent</span>.<span class="name">width</span>, <span class="name">parent</span>.<span class="name">height</span>)
<span class="name">smooth</span>: <span class="number">true</span>
<span class="name">visible</span>: <span class="number">false</span>
}
<span class="type"><a href="qml-qtgraphicaleffects-desaturate.html">Desaturate</a></span> {
<span class="name">anchors</span>.fill: <span class="name">bug</span>
<span class="name">source</span>: <span class="name">bug</span>
<span class="name">desaturation</span>: <span class="number">0.8</span>
}
}</pre>
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<h2>Property Documentation</h2>
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<div class="qmlitem"><div class="qmlproto"><div class="table"><table class="qmlname"><tr valign="top" class="odd" id="cached-prop"><td class="tblQmlPropNode"><p><a name="cached-prop"></a><span class="name">cached</span> : <span class="type">bool</span></p></td></tr></table></div></div><div class="qmldoc"><p>This property allows the effect output pixels to be cached in order to improve the rendering performance.</p>
<p>Every time the source or effect properties are changed, the pixels in the cache must be updated. Memory consumption is increased, because an extra buffer of memory is required for storing the effect output.</p>
<p>It is recommended to disable the cache when the source or the effect properties are animated.</p>
<p>By default, the property is set to <code>false</code>.</p>
</div></div><!-- @@@cached -->
<br/>
<!-- $$$desaturation -->
<div class="qmlitem"><div class="qmlproto"><div class="table"><table class="qmlname"><tr valign="top" class="odd" id="desaturation-prop"><td class="tblQmlPropNode"><p><a name="desaturation-prop"></a><span class="name">desaturation</span> : <span class="type">real</span></p></td></tr></table></div></div><div class="qmldoc"><p>This property defines how much the source colors are desaturated.</p>
<p>The value ranges from 0.0 (no change) to 1.0 (desaturated). By default, the property is set to <code>0.0</code> (no change).</p>
<div class="table"><table class="generic">
<thead><tr class="qt-style"><th >Output examples with different desaturation values</th><th ></th><th ></th></tr></thead>
<tr valign="top" class="odd"><td ><p class="centerAlign"><img src="images/Desaturate_desaturation1.png" alt="" /></p></td><td ><p class="centerAlign"><img src="images/Desaturate_desaturation2.png" alt="" /></p></td><td ><p class="centerAlign"><img src="images/Desaturate_desaturation3.png" alt="" /></p></td></tr>
<tr valign="top" class="even"><td ><b> desaturation: 0.0 </b></td><td ><b> desaturation: 0.5 </b></td><td ><b> desaturation: 1.0 </b></td></tr>
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</div></div><!-- @@@desaturation -->
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<!-- $$$source -->
<div class="qmlitem"><div class="qmlproto"><div class="table"><table class="qmlname"><tr valign="top" class="odd" id="source-prop"><td class="tblQmlPropNode"><p><a name="source-prop"></a><span class="name">source</span> : <span class="type"><a href="../qtqml/qml-variant.html">variant</a></span></p></td></tr></table></div></div><div class="qmldoc"><p>This property defines the source item that provides the source pixels to the effect.</p>
<p><b>Note: </b>It is not supported to let the effect include itself, for instance by setting source to the effect's parent.</p></div></div><!-- @@@source -->
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