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<h1 class="title">Obsolete Members for QImage</h1>
<p><b>The following class members are obsolete.</b> They are provided to keep old source code working. We strongly advise against using them in new code.</p>
<p><ul><li><a href="qimage.html">QImage class reference</a></li></ul></p>
<h2>Public Functions</h2>
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<tr><td class="memItemLeft topAlign rightAlign"> QImage </td><td class="memItemRight bottomAlign"><b><a href="qimage-obsolete.html#alphaChannel">alphaChannel</a></b> () const<tt> (obsolete)</tt></td></tr>
<tr><td class="memItemLeft topAlign rightAlign"> int </td><td class="memItemRight bottomAlign"><b><a href="qimage-obsolete.html#serialNumber">serialNumber</a></b> () const<tt> (obsolete)</tt></td></tr>
<tr><td class="memItemLeft topAlign rightAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qimage-obsolete.html#setAlphaChannel">setAlphaChannel</a></b> ( const QImage & <i>alphaChannel</i> )<tt> (obsolete)</tt></td></tr>
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<h2>Member Function Documentation</h2>
<!-- $$$alphaChannel[overload1]$$$alphaChannel -->
<h3 class="fn"><a name="alphaChannel"></a><span class="type">QImage</span> QImage::<span class="name">alphaChannel</span> () const</h3>
<p>Returns the alpha channel of the image as a new grayscale <a href="qimage.html">QImage</a> in which each pixel's red, green, and blue values are given the alpha value of the original image. The color depth of the returned image is 8-bit.</p>
<p>You can see an example of use of this function in <a href="qpixmap.html">QPixmap</a>'s <a href="qpixmap-qt3.html#alphaChannel" class="compat">alphaChannel()</a>, which works in the same way as this function on QPixmaps.</p>
<p>Most usecases for this function can be replaced with <a href="qpainter.html">QPainter</a> and using composition modes.</p>
<p><b>Warning:</b> This is an expensive function.</p>
<p><b>See also </b><a href="qimage-obsolete.html#setAlphaChannel">setAlphaChannel</a>(), <a href="qimage.html#hasAlphaChannel">hasAlphaChannel</a>(), <a href="qpixmap.html#pixmap-information">Pixmap</a>, and <a href="qimage.html#image-transformations">Image Transformations</a>.</p>
<!-- @@@alphaChannel -->
<!-- $$$serialNumber[overload1]$$$serialNumber -->
<h3 class="fn"><a name="serialNumber"></a><span class="type">int</span> QImage::<span class="name">serialNumber</span> () const</h3>
<p>Returns a number that identifies the contents of this <a href="qimage.html">QImage</a> object. Distinct <a href="qimage.html">QImage</a> objects can only have the same serial number if they refer to the same contents (but they don't have to).</p>
<p>Use <a href="qimage.html#cacheKey">cacheKey</a>() instead.</p>
<p><b>Warning:</b> The serial number doesn't necessarily change when the image is altered. This means that it may be dangerous to use it as a cache key.</p>
<p><b>See also </b><a href="qimage.html#operator-eq-eq">operator==</a>().</p>
<!-- @@@serialNumber -->
<!-- $$$setAlphaChannel[overload1]$$$setAlphaChannelconstQImage& -->
<h3 class="fn"><a name="setAlphaChannel"></a><span class="type">void</span> QImage::<span class="name">setAlphaChannel</span> ( const <span class="type">QImage</span> & <i>alphaChannel</i> )</h3>
<p>Sets the alpha channel of this image to the given <i>alphaChannel</i>.</p>
<p>If <i>alphaChannel</i> is an 8 bit grayscale image, the intensity values are written into this buffer directly. Otherwise, <i>alphaChannel</i> is converted to 32 bit and the intensity of the RGB pixel values is used.</p>
<p>Note that the image will be converted to the <a href="qimage.html#Format-enum">Format_ARGB32_Premultiplied</a> format if the function succeeds.</p>
<p>Use one of the composition modes in <a href="qpainter.html#CompositionMode-enum">QPainter::CompositionMode</a> instead.</p>
<p><b>Warning:</b> This function is expensive.</p>
<p><b>See also </b><a href="qimage-obsolete.html#alphaChannel">alphaChannel</a>(), <a href="qimage.html#image-transformations">Image Transformations</a>, and <a href="qimage.html#image-formats">Image Formats</a>.</p>
<!-- @@@setAlphaChannel -->
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