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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html> <head> <title>Applies an expression to an image</title> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> </head> <body><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.imagick-equalizeimage.html">Imagick::equalizeImage</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.imagick-flattenimages.html">Imagick::flattenImages</a></div> <div class="up"><a href="class.imagick.html">The Imagick class</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div id="function.imagick-evaluateimage" class="refentry"> <div class="refnamediv"> <h1 class="refname">Imagick::evaluateImage</h1> <p class="verinfo">(No version information available, might be only in CVS)</p><p class="refpurpose"><span class="refname">Imagick::evaluateImage</span> — <span class="dc-title">Applies an expression to an image</span></p> </div> <div class="refsect1 description"> <h3 class="title">Description</h3> <div class="methodsynopsis dc-description"> <span class="type">bool</span> <span class="methodname"><b><b>Imagick::evaluateImage</b></b></span> ( <span class="methodparam"><span class="type">int</span> <tt class="parameter">$op</tt></span> , <span class="methodparam"><span class="type">float</span> <tt class="parameter">$constant</tt></span> [, <span class="methodparam"><span class="type">int</span> <tt class="parameter">$channel</tt></span> ] )</div> <div class="warning"><b class="warning">Warning</b><p class="simpara">This function iscurrently not documented; only its argument list is available.</p></div> <p class="para"> Applys an arithmetic, relational, or logical expression to an image. Use these operators to lighten or darken an image, to increase or decrease contrast in an image, or to produce the "negative" of an image. </p> </div> <div class="refsect1 parameters"> <h3 class="title">Parameters</h3> <p class="para"> <dl> <dt> <span class="term"><i><tt class="parameter">op</tt></i></span> <dd> <p class="para"> The operator </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">constant</tt></i></span> <dd> <p class="para"> The value of the operator </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">channel</tt></i></span> <dd> <p class="para"> Provide any channel constant that is valid for your channel mode. To apply to more than one channel, combine channeltype constants using bitwise operators. Defaults to Imagick::CHANNEL_ALL. Refer to this list of <a href="imagick.constants.html#imagick.constants.channel" class="link">channel constants</a>. </p> </dd> </dt> </dl> </p> </div> <div class="refsect1 returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> Returns <b><tt>TRUE</tt></b> on success. </p> </div> <div class="refsect1 errors"> <h3 class="title">Errors/Exceptions</h3> <p class="para"> Throws ImagickException on error. </p> </div></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.imagick-equalizeimage.html">Imagick::equalizeImage</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.imagick-flattenimages.html">Imagick::flattenImages</a></div> <div class="up"><a href="class.imagick.html">The Imagick class</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div></body></html>⌨️ 快捷键说明
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