function.imagefilter.html
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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 a filter 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.imagefilltoborder.html">imagefilltoborder</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.imagefontheight.html">imagefontheight</a></div> <div class="up"><a href="ref.image.html">GD Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div id="function.imagefilter" class="refentry"> <div class="refnamediv"> <h1 class="refname">imagefilter</h1> <p class="verinfo">(PHP 5)</p><p class="refpurpose"><span class="refname">imagefilter</span> — <span class="dc-title">Applies a filter 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>imagefilter</b></b></span> ( <span class="methodparam"><span class="type">resource</span> <tt class="parameter">$image</tt></span> , <span class="methodparam"><span class="type">int</span> <tt class="parameter">$filtertype</tt></span> [, <span class="methodparam"><span class="type">int</span> <tt class="parameter">$arg1</tt></span> [, <span class="methodparam"><span class="type">int</span> <tt class="parameter">$arg2</tt></span> [, <span class="methodparam"><span class="type">int</span> <tt class="parameter">$arg3</tt></span> [, <span class="methodparam"><span class="type">int</span> <tt class="parameter">$arg4</tt></span> ]]]] )</div> <p class="para rdfs-comment"> <b>imagefilter()</b> applies the given filter <i><tt class="parameter">filtertype</tt></i> on the <i><tt class="parameter">image</tt></i>. </p> </div> <div class="refsect1 parameters"> <h3 class="title">Parameters</h3> <p class="para"> <dl> <dt><span class="term"><i><tt class="parameter">image</tt></i></span><dd><p class="para">An image resource, returned by one of the image creation functions, such as <a href="function.imagecreatetruecolor.html" class="function">imagecreatetruecolor()</a>.</p></dd></dt> <dt> <span class="term"><i><tt class="parameter">filtertype</tt></i></span> <dd> <p class="para"> <i><tt class="parameter">filtertype</tt></i> can be one of the following: <ul class="itemizedlist"> <li class="listitem"> <span class="simpara"> <b><tt>IMG_FILTER_NEGATE</tt></b>: Reverses all colors of the image. </span> </li> <li class="listitem"> <span class="simpara"> <b><tt>IMG_FILTER_GRAYSCALE</tt></b>: Converts the image into grayscale. </span> </li> <li class="listitem"> <span class="simpara"> <b><tt>IMG_FILTER_BRIGHTNESS</tt></b>: Changes the brightness of the image. Use <i><tt class="parameter">arg1</tt></i> to set the level of brightness. </span> </li> <li class="listitem"> <span class="simpara"> <b><tt>IMG_FILTER_CONTRAST</tt></b>: Changes the contrast of the image. Use <i><tt class="parameter">arg1</tt></i> to set the level of contrast. </span> </li> <li class="listitem"> <span class="simpara"> <b><tt>IMG_FILTER_COLORIZE</tt></b>: Like <b><tt>IMG_FILTER_GRAYSCALE</tt></b>, except you can specify the color. Use <i><tt class="parameter">arg1</tt></i>, <i><tt class="parameter">arg2</tt></i> and <i><tt class="parameter">arg3</tt></i> in the form of <i><tt class="parameter">red</tt></i>, <i><tt class="parameter">blue</tt></i>, <i><tt class="parameter">green</tt></i> and <i><tt class="parameter">arg4</tt></i> for the <i><tt class="parameter">alpha</tt></i> channel. The range for each color is 0 to 255. </span> </li> <li class="listitem"> <span class="simpara"> <b><tt>IMG_FILTER_EDGEDETECT</tt></b>: Uses edge detection to highlight the edges in the image. </span> </li> <li class="listitem"> <span class="simpara"> <b><tt>IMG_FILTER_EMBOSS</tt></b>: Embosses the image. </span> </li> <li class="listitem"> <span class="simpara"> <b><tt>IMG_FILTER_GAUSSIAN_BLUR</tt></b>: Blurs the image using the Gaussian method. </span> </li> <li class="listitem"> <span class="simpara"> <b><tt>IMG_FILTER_SELECTIVE_BLUR</tt></b>: Blurs the image. </span> </li> <li class="listitem"> <span class="simpara"> <b><tt>IMG_FILTER_MEAN_REMOVAL</tt></b>: Uses mean removal to achieve a "sketchy" effect. </span> </li> <li class="listitem"> <span class="simpara"> <b><tt>IMG_FILTER_SMOOTH</tt></b>: Makes the image smoother. Use <i><tt class="parameter">arg1</tt></i> to set the level of smoothness. </span> </li> </ul> </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">arg1</tt></i></span> <dd> <p class="para"> <ul class="itemizedlist"> <li class="listitem"> <span class="simpara"> <b><tt>IMG_FILTER_BRIGHTNESS</tt></b>: Brightness level. </span> </li> <li class="listitem"> <span class="simpara"> <b><tt>IMG_FILTER_CONTRAST</tt></b>: Contrast level. </span> </li> <li class="listitem"> <span class="simpara"> <b><tt>IMG_FILTER_COLORIZE</tt></b>: Value of red component. </span> </li> <li class="listitem"> <span class="simpara"> <b><tt>IMG_FILTER_SMOOTH</tt></b>: Smoothness level. </span>⌨️ 快捷键说明
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