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39 lines
2.1 KiB
HTML
39 lines
2.1 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<head>
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<meta http-equiv="content-type" content="text/html; charset=UTF-8">
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<title>取得与指定的颜色最接近的颜色的索引值</title>
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</head>
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<body class="docs"><div id="layout">
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<div id="layout-content"><div id="function.imagecolorclosest" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">imagecolorclosest</h1>
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<p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">imagecolorclosest</span> — <span class="dc-title">取得与指定的颜色最接近的颜色的索引值</span></p>
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</div>
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<div class="refsect1 unknown-unknown-seealsq" id="refsect1-function.imagecolorclosest-unknown-unknown-seealsq">
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<h3 class="title">说明</h3>
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<div class="methodsynopsis dc-description">
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<span class="methodname"><strong>imagecolorclosest</strong></span>
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( <span class="methodparam"><span class="type">resource</span> <code class="parameter">$image</code></span>
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, <span class="methodparam"><span class="type">int</span> <code class="parameter">$red</code></span>
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, <span class="methodparam"><span class="type">int</span> <code class="parameter">$green</code></span>
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, <span class="methodparam"><span class="type">int</span> <code class="parameter">$blue</code></span>
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) : <span class="type">int</span></div>
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<p class="para rdfs-comment">
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返回图像调色板中与指定的 <acronym title="Red-Green-Blue">RGB</acronym> 值最“接近”的颜色。
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</p>
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<p class="para">
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指定的颜色与调色板中的每个颜色的“距离”的计算方法是把
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<acronym title="Red-Green-Blue">RGB</acronym> 值当成三维空间中点的坐标。
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</p>
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<p class="para">
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如果从文件创建了图像，只有图像中使用了的颜色会被辨析。仅出现在调色板中的颜色不会被辨析。
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</p>
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<p class="para">
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参见 <span class="function"><a href="imagecolorexact.html" class="function">imagecolorexact()</a></span>。
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</p>
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</div>
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</div></div></div></body></html> |