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<!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>取得与指定的颜色加透明度最接近的颜色</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.imagecolorclosestalpha" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">imagecolorclosestalpha</h1>
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<p class="verinfo">(PHP 4 >= 4.0.6, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">imagecolorclosestalpha</span> — <span class="dc-title">取得与指定的颜色加透明度最接近的颜色</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.imagecolorclosestalpha-description">
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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>imagecolorclosestalpha</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="methodparam"><span class="type">int</span> <code class="parameter">$alpha</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> 值以及
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<code class="parameter">alpha</code> 深度最“接近”的颜色。
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.imagecolorclosestalpha-parameters">
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<h3 class="title">参数</h3>
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<p class="para">
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<dl>
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<dt>
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<code class="parameter">image</code></dt>
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<dd>
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<p class="para">由图象创建函数(例如<span class="function"><a href="imagecreatetruecolor.html" class="function">imagecreatetruecolor()</a></span>)返回的图象资源。</p></dd>
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<dt>
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<code class="parameter">red</code></dt>
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<dd>
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<p class="para">红色成分的值。</p>
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</dd>
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<dt>
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<code class="parameter">green</code></dt>
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<dd>
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<p class="para">绿色成分的值。</p>
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</dd>
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<dt>
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<code class="parameter">blue</code></dt>
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<dd>
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<p class="para">蓝色成分的值。</p>
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</dd>
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<dt>
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<code class="parameter">alpha</code></dt>
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<dd>
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<p class="para">
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A value between <em>0</em> and <em>127</em>.
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<em>0</em> indicates completely opaque while
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<em>127</em> indicates completely transparent.
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</p>
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</dd>
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</dl>
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The colors parameters are integers between 0 and 255 or hexadecimals
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between 0x00 and 0xFF.
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</p>
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</div>
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<div class="refsect1 returnvalues" id="refsect1-function.imagecolorclosestalpha-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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Returns the index of the closest color in the palette.
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.imagecolorclosestalpha-examples">
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<h3 class="title">范例</h3>
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<p class="para">
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<div class="example" id="example-3665">
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<p><strong>Example #1 Search for a set of colors in an image</strong></p>
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<div class="example-contents">
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<div class="phpcode"><pre><span style="color: #000000">
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<span style="color: #0000BB"><?php<br /></span><span style="color: #FF8000">// Start with an image and convert it to a palette-based image<br /></span><span style="color: #0000BB">$im </span><span style="color: #007700">= </span><span style="color: #0000BB">imagecreatefrompng</span><span style="color: #007700">(</span><span style="color: #DD0000">'figures/imagecolorclosest.png'</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">imagetruecolortopalette</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">, </span><span style="color: #0000BB">false</span><span style="color: #007700">, </span><span style="color: #0000BB">255</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// Search colors (RGB)<br /></span><span style="color: #0000BB">$colors </span><span style="color: #007700">= array(<br /> array(</span><span style="color: #0000BB">254</span><span style="color: #007700">, </span><span style="color: #0000BB">145</span><span style="color: #007700">, </span><span style="color: #0000BB">154</span><span style="color: #007700">, </span><span style="color: #0000BB">50</span><span style="color: #007700">),<br /> array(</span><span style="color: #0000BB">153</span><span style="color: #007700">, </span><span style="color: #0000BB">145</span><span style="color: #007700">, </span><span style="color: #0000BB">188</span><span style="color: #007700">, </span><span style="color: #0000BB">127</span><span style="color: #007700">),<br /> array(</span><span style="color: #0000BB">153</span><span style="color: #007700">, </span><span style="color: #0000BB">90</span><span style="color: #007700">, </span><span style="color: #0000BB">145</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">),<br /> array(</span><span style="color: #0000BB">255</span><span style="color: #007700">, </span><span style="color: #0000BB">137</span><span style="color: #007700">, </span><span style="color: #0000BB">92</span><span style="color: #007700">, </span><span style="color: #0000BB">84</span><span style="color: #007700">)<br />);<br /><br /></span><span style="color: #FF8000">// Loop through each search and find the closest color in the palette.<br />// Return the search number, the search RGB and the converted RGB match<br /></span><span style="color: #007700">foreach(</span><span style="color: #0000BB">$colors </span><span style="color: #007700">as </span><span style="color: #0000BB">$id </span><span style="color: #007700">=> </span><span style="color: #0000BB">$rgb</span><span style="color: #007700">)<br />{<br /> </span><span style="color: #0000BB">$result </span><span style="color: #007700">= </span><span style="color: #0000BB">imagecolorclosestalpha</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">, </span><span style="color: #0000BB">$rgb</span><span style="color: #007700">[</span><span style="color: #0000BB">0</span><span style="color: #007700">], </span><span style="color: #0000BB">$rgb</span><span style="color: #007700">[</span><span style="color: #0000BB">1</span><span style="color: #007700">], </span><span style="color: #0000BB">$rgb</span><span style="color: #007700">[</span><span style="color: #0000BB">2</span><span style="color: #007700">], </span><span style="color: #0000BB">$rgb</span><span style="color: #007700">[</span><span style="color: #0000BB">3</span><span style="color: #007700">]);<br /> </span><span style="color: #0000BB">$result </span><span style="color: #007700">= </span><span style="color: #0000BB">imagecolorsforindex</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">, </span><span style="color: #0000BB">$result</span><span style="color: #007700">);<br /> </span><span style="color: #0000BB">$result </span><span style="color: #007700">= </span><span style="color: #DD0000">"(</span><span style="color: #007700">{</span><span style="color: #0000BB">$result</span><span style="color: #007700">[</span><span style="color: #DD0000">'red'</span><span style="color: #007700">]}</span><span style="color: #DD0000">, </span><span style="color: #007700">{</span><span style="color: #0000BB">$result</span><span style="color: #007700">[</span><span style="color: #DD0000">'green'</span><span style="color: #007700">]}</span><span style="color: #DD0000">, </span><span style="color: #007700">{</span><span style="color: #0000BB">$result</span><span style="color: #007700">[</span><span style="color: #DD0000">'blue'</span><span style="color: #007700">]}</span><span style="color: #DD0000">, </span><span style="color: #007700">{</span><span style="color: #0000BB">$result</span><span style="color: #007700">[</span><span style="color: #DD0000">'alpha'</span><span style="color: #007700">]}</span><span style="color: #DD0000">)"</span><span style="color: #007700">;<br /><br /> echo </span><span style="color: #DD0000">"#</span><span style="color: #0000BB">$id</span><span style="color: #DD0000">: Search (</span><span style="color: #0000BB">$rgb</span><span style="color: #007700">[</span><span style="color: #0000BB">0</span><span style="color: #007700">]</span><span style="color: #DD0000">, </span><span style="color: #0000BB">$rgb</span><span style="color: #007700">[</span><span style="color: #0000BB">1</span><span style="color: #007700">]</span><span style="color: #DD0000">, </span><span style="color: #0000BB">$rgb</span><span style="color: #007700">[</span><span style="color: #0000BB">2</span><span style="color: #007700">]</span><span style="color: #DD0000">, </span><span style="color: #0000BB">$rgb</span><span style="color: #007700">[</span><span style="color: #0000BB">3</span><span style="color: #007700">]</span><span style="color: #DD0000">); Closest match: </span><span style="color: #0000BB">$result</span><span style="color: #DD0000">.\n"</span><span style="color: #007700">;<br />}<br /><br /></span><span style="color: #0000BB">imagedestroy</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?></span>
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</span>
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</pre></div>
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</div>
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<div class="example-contents"><p>以上例程的输出类似于：</p></div>
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<div class="example-contents screen">
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<div class="cdata"><pre>
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#0: Search (254, 145, 154, 50); Closest match: (252, 150, 148, 0).
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#1: Search (153, 145, 188, 127); Closest match: (148, 150, 196, 0).
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#2: Search (153, 90, 145, 0); Closest match: (148, 90, 156, 0).
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#3: Search (255, 137, 92, 84); Closest match: (252, 150, 92, 0).
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</pre></div>
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</div>
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</div>
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</p>
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</div>
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<div class="refsect1 notes" id="refsect1-function.imagecolorclosestalpha-notes">
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<h3 class="title">注释</h3>
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<blockquote class="note"><p><strong class="note">Note</strong>: <span class="simpara">此函数需要 GD 2.0.1 或更高版本(推荐 2.0.28 及更高版本)。</span></p></blockquote>
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</div>
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<div class="refsect1 seealso" id="refsect1-function.imagecolorclosestalpha-seealso">
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<h3 class="title">参见</h3>
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<p class="para">
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<ul class="simplelist">
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<li class="member"><span class="function"><a href="imagecolorexactalpha.html" class="function" rel="rdfs-seeAlso">imagecolorexactalpha()</a> - 取得指定的颜色加透明度的索引值</span></li>
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<li class="member"><span class="function"><a href="imagecolorclosest.html" class="function" rel="rdfs-seeAlso">imagecolorclosest()</a> - 取得与指定的颜色最接近的颜色的索引值</span></li>
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<li class="member"><span class="function"><a href="imagecolorclosesthwb.html" class="function" rel="rdfs-seeAlso">imagecolorclosesthwb()</a> - 取得与给定颜色最接近的色度的黑白色的索引</span></li>
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</ul>
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</p>
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</div>
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</div></div></div></body></html> |