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324 lines
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HTML
324 lines
14 KiB
HTML
<div class="header">
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<div class="subTitle">
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javax.imageio.plugins.jpeg
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</div>
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<h2 class="title" title="Class JPEGQTable">Class JPEGQTable</h2>
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</div><div class="contentContainer">
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<ul class="inheritance">
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<li><a href="../../../../java/lang/Object.html" title="class in java.lang">java.lang.Object</a></li>
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<li>
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<ul class="inheritance">
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<li>javax.imageio.plugins.jpeg.JPEGQTable</li>
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</ul> </li>
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</ul>
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<div class="description">
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<hr/> <br/> <pre>public class <span class="typeNameLabel">JPEGQTable</span>
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extends <a href="../../../../java/lang/Object.html" title="class in java.lang">Object</a></pre>
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<div class="block">
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<span>一个封装单个JPEG量化表的类。</span>
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<span>元素以自然的顺序出现（而不是锯齿形顺序）。</span>
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<span>为从JPEG规范的附录K获得的“标准”表以及常规用于视觉无损编码的默认表提供了静态变量。</span>
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<p> <span>有关标准JPEG插件的操作的更多信息，请参阅<a href="../../metadata/doc-files/jpeg_metadata.html">JPEG metadata format specification and usage notes</a></span> </p>
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</div> </li>
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</ul>
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</div>
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<div class="summary">
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<!-- =========== FIELD SUMMARY =========== -->
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<ul class="blockList">
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<li class="blockList"><a name="field.summary">
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<!-- --> </a> <h3>Field Summary</h3>
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<table border="0" cellpadding="3" cellspacing="0" class="memberSummary" summary="Field Summary table, listing fields, and an explanation">
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<caption>
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<span>Fields</span>
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<span class="tabEnd"> </span>
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</caption>
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<tbody>
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<tr>
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<th class="colFirst" scope="col">Modifier and Type</th>
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<th class="colLast" scope="col">Field and Description</th>
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</tr>
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<tr class="altColor">
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<td class="colFirst"><code>static <a href="../../../../javax/imageio/plugins/jpeg/JPEGQTable.html" title="class in javax.imageio.plugins.jpeg">JPEGQTable</a></code></td>
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<td class="colLast"><code><span class="memberNameLink"><a href="../../../../javax/imageio/plugins/jpeg/JPEGQTable.html#K1Div2Luminance">K1Div2Luminance</a></span></code>
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<div class="block">
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JPEG规范中给出的采样亮度量化表，表K.1，所有元素除以2。
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</div> </td>
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</tr>
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<tr class="rowColor">
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<td class="colFirst"><code>static <a href="../../../../javax/imageio/plugins/jpeg/JPEGQTable.html" title="class in javax.imageio.plugins.jpeg">JPEGQTable</a></code></td>
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<td class="colLast"><code><span class="memberNameLink"><a href="../../../../javax/imageio/plugins/jpeg/JPEGQTable.html#K1Luminance">K1Luminance</a></span></code>
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<div class="block">
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JPEG规范中给出的样本亮度量化表，表K.1。
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</div> </td>
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</tr>
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<tr class="altColor">
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<td class="colFirst"><code>static <a href="../../../../javax/imageio/plugins/jpeg/JPEGQTable.html" title="class in javax.imageio.plugins.jpeg">JPEGQTable</a></code></td>
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<td class="colLast"><code><span class="memberNameLink"><a href="../../../../javax/imageio/plugins/jpeg/JPEGQTable.html#K2Chrominance">K2Chrominance</a></span></code>
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<div class="block">
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JPEG规范中给出的样本色度量化表，表K.2。
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</div> </td>
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</tr>
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<tr class="rowColor">
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<td class="colFirst"><code>static <a href="../../../../javax/imageio/plugins/jpeg/JPEGQTable.html" title="class in javax.imageio.plugins.jpeg">JPEGQTable</a></code></td>
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<td class="colLast"><code><span class="memberNameLink"><a href="../../../../javax/imageio/plugins/jpeg/JPEGQTable.html#K2Div2Chrominance">K2Div2Chrominance</a></span></code>
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<div class="block">
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JPEG规范中给出的样本色度量化表，表K.1，所有元素除以2。
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</div> </td>
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</tr>
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</tbody>
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</table> </li>
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</ul>
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<!-- ======== CONSTRUCTOR SUMMARY ======== -->
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<li class="blockList"><a name="constructor.summary">
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<!-- --> </a> <h3>构造方法摘要</h3>
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<table border="0" cellpadding="3" cellspacing="0" class="memberSummary" summary="Constructor Summary table, listing constructors, and an explanation">
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<caption>
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<span>构造方法</span>
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<span class="tabEnd"> </span>
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</caption>
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<tbody>
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<tr>
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<th class="colOne" scope="col">Constructor and Description</th>
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</tr>
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<tr class="altColor">
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../../javax/imageio/plugins/jpeg/JPEGQTable.html#JPEGQTable-int:A-">JPEGQTable</a></span>(int[] table)</code>
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<div class="block">
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从参数构造一个量化表，它必须包含自然顺序的64个元素（不是zig-zag顺序）。
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</div> </td>
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</tr>
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</tbody>
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</table> </li>
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</ul>
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<!-- ========== METHOD SUMMARY =========== -->
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<ul class="blockList">
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<li class="blockList"><a name="method.summary">
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<!-- --> </a> <h3>方法摘要</h3>
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<table border="0" cellpadding="3" cellspacing="0" class="memberSummary" summary="Method Summary table, listing methods, and an explanation">
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<caption>
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<span class="activeTableTab" id="t0"><span>所有方法</span><span class="tabEnd"> </span></span>
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<span class="tableTab" id="t2"><span><a href="javascript:show(2);">接口方法</a></span><span class="tabEnd"> </span></span>
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<span class="tableTab" id="t4"><span><a href="javascript:show(8);">具体的方法</a></span><span class="tabEnd"> </span></span>
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</caption>
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<tbody>
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<tr>
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<th class="colFirst" scope="col">Modifier and Type</th>
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<th class="colLast" scope="col">Method and Description</th>
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</tr>
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<tr class="altColor" id="i0">
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<td class="colFirst"><code><a href="../../../../javax/imageio/plugins/jpeg/JPEGQTable.html" title="class in javax.imageio.plugins.jpeg">JPEGQTable</a></code></td>
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<td class="colLast"><code><span class="memberNameLink"><a href="../../../../javax/imageio/plugins/jpeg/JPEGQTable.html#getScaledInstance-float-boolean-">getScaledInstance</a></span>(float scaleFactor, boolean forceBaseline)</code>
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<div class="block">
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返回一个新的量化表，其中值乘以
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<code>scaleFactor</code> ，然后钳位到范围
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<code>forceBaseline</code> （如果
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<code>forceBaseline</code>为真，则为1..255）。
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</div> </td>
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</tr>
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<tr class="rowColor" id="i1">
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<td class="colFirst"><code>int[]</code></td>
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<td class="colLast"><code><span class="memberNameLink"><a href="../../../../javax/imageio/plugins/jpeg/JPEGQTable.html#getTable--">getTable</a></span>()</code>
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<div class="block">
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返回当前量化表的副本作为阵列
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<code>int</code> S IN天然（非Z字形）的顺序。
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</div> </td>
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</tr>
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<tr class="altColor" id="i2">
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<td class="colFirst"><code><a href="../../../../java/lang/String.html" title="class in java.lang">String</a></code></td>
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<td class="colLast"><code><span class="memberNameLink"><a href="../../../../javax/imageio/plugins/jpeg/JPEGQTable.html#toString--">toString</a></span>()</code>
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<div class="block">
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返回
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<code>String</code>表示此量化表。
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</div> </td>
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</tr>
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</tbody>
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</table>
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<ul class="blockList">
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<li class="blockList"><a name="methods.inherited.from.class.java.lang.Object">
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<!-- --> </a> <h3>Methods inherited from class java.lang.<a href="../../../../java/lang/Object.html" title="class in java.lang">Object</a></h3> <code><a href="../../../../java/lang/Object.html#clone--">clone</a>, <a href="../../../../java/lang/Object.html#equals-java.lang.Object-">equals</a>, <a href="../../../../java/lang/Object.html#finalize--">finalize</a>, <a href="../../../../java/lang/Object.html#getClass--">getClass</a>, <a href="../../../../java/lang/Object.html#hashCode--">hashCode</a>, <a href="../../../../java/lang/Object.html#notify--">notify</a>, <a href="../../../../java/lang/Object.html#notifyAll--">notifyAll</a>, <a href="../../../../java/lang/Object.html#wait--">wait</a>, <a href="../../../../java/lang/Object.html#wait-long-">wait</a>, <a href="../../../../java/lang/Object.html#wait-long-int-">wait</a></code></li>
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</ul> </li>
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</ul> </li>
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</ul>
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</div>
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<div class="details">
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<ul class="blockList">
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<li class="blockList">
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<!-- ============ FIELD DETAIL =========== -->
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<ul class="blockList">
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<li class="blockList"><a name="field.detail">
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<!-- --> </a> <h3>字段详细信息</h3> <a name="K1Luminance">
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<!-- --> </a>
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<ul class="blockList">
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<li class="blockList"> <h4>K1Luminance</h4> <pre>public static final <a href="../../../../javax/imageio/plugins/jpeg/JPEGQTable.html" title="class in javax.imageio.plugins.jpeg">JPEGQTable</a> K1Luminance</pre>
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<div class="block">
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<span>JPEG规范中给出的样本亮度量化表，表K.1。</span>
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<span>根据规范，这些值产生“良好”的质量输出。</span>
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</div>
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<dl>
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<dt>
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<span class="seeLabel">另请参见：</span>
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</dt>
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<dd>
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<a href="../../../../javax/imageio/plugins/jpeg/JPEGQTable.html#K1Div2Luminance"><code>K1Div2Luminance</code></a>
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</dd>
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</dl> </li>
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</ul> <a name="K1Div2Luminance">
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<!-- --> </a>
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<ul class="blockList">
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<li class="blockList"> <h4>K1Div2Luminance</h4> <pre>public static final <a href="../../../../javax/imageio/plugins/jpeg/JPEGQTable.html" title="class in javax.imageio.plugins.jpeg">JPEGQTable</a> K1Div2Luminance</pre>
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<div class="block">
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<span>在JPEG规范中给出的样本亮度量化表，表K.1，所有元素除以2.根据规范，这些值产生“非常好”的质量输出。</span>
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<span>这是通常用于“视觉无损”编码的表，如果使用默认表和质量设置，则使用默认亮度表。</span>
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</div>
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<dl>
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<dt>
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<span class="seeLabel">另请参见：</span>
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</dt>
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<dd>
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<a href="../../../../javax/imageio/plugins/jpeg/JPEGQTable.html#K1Luminance"><code>K1Luminance</code></a>
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</dd>
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</dl> </li>
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</ul> <a name="K2Chrominance">
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<!-- --> </a>
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<ul class="blockList">
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<li class="blockList"> <h4>K2Chrominance</h4> <pre>public static final <a href="../../../../javax/imageio/plugins/jpeg/JPEGQTable.html" title="class in javax.imageio.plugins.jpeg">JPEGQTable</a> K2Chrominance</pre>
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<div class="block">
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<span>JPEG规范中给出的样本色度量化表，表K.2。</span>
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<span>根据规范，这些值产生“良好”的质量输出。</span>
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</div>
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<dl>
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<dt>
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<span class="seeLabel">另请参见：</span>
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</dt>
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<dd>
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<a href="../../../../javax/imageio/plugins/jpeg/JPEGQTable.html#K2Div2Chrominance"><code>K2Div2Chrominance</code></a>
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</dd>
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</dl> </li>
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</ul> <a name="K2Div2Chrominance">
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<!-- --> </a>
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<ul class="blockListLast">
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<li class="blockList"> <h4>K2Div2Chrominance</h4> <pre>public static final <a href="../../../../javax/imageio/plugins/jpeg/JPEGQTable.html" title="class in javax.imageio.plugins.jpeg">JPEGQTable</a> K2Div2Chrominance</pre>
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<div class="block">
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<span>JPEG规范中给出的样本色度量化表，表K.1，所有元素除以2.根据规范，这些值产生“非常好”的质量输出。</span>
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<span>这是通常用于“视觉无损”编码的表，如果使用默认表和质量设置，则使用默认色度表。</span>
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</div>
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<dl>
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<dt>
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<span class="seeLabel">另请参见：</span>
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</dt>
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<dd>
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<a href="../../../../javax/imageio/plugins/jpeg/JPEGQTable.html#K2Chrominance"><code>K2Chrominance</code></a>
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</dd>
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</dl> </li>
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</ul> </li>
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</ul>
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<!-- ========= CONSTRUCTOR DETAIL ======== -->
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<ul class="blockList">
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<li class="blockList"><a name="constructor.detail">
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<!-- --> </a> <h3>构造方法详细信息</h3> <a name="JPEGQTable-int:A-">
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<!-- --> </a>
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<ul class="blockListLast">
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<li class="blockList"> <h4>JPEGQTable</h4> <pre>public JPEGQTable(int[] table)</pre>
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<div class="block">
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<span>从参数构造一个量化表，它必须包含自然顺序的64个元素（不是zig-zag顺序）。</span>
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<span>复制是由输入数组组成的。</span>
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</div>
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<dl>
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<dt>
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<span class="paramLabel">参数</span>
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</dt>
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<dd>
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<code>table</code> - 量化表，作为
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<code>int</code>数组。
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</dd>
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<dt>
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<span class="throwsLabel">异常</span>
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</dt>
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<dd>
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<code><a href="../../../../java/lang/IllegalArgumentException.html" title="class in java.lang">IllegalArgumentException</a></code> - 如果
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<code>table</code>是
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<code>null</code>或
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<code>table.length</code>不等于64。
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</dd>
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</dl> </li>
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</ul> </li>
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</ul>
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<!-- ============ METHOD DETAIL ========== -->
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<ul class="blockList">
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<li class="blockList"><a name="method.detail">
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<!-- --> </a> <h3>方法详细信息</h3> <a name="getTable--">
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<!-- --> </a>
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<ul class="blockList">
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<li class="blockList"> <h4>getTable</h4> <pre>public int[] getTable()</pre>
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<div class="block">
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返回当前量化表的副本作为阵列
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<code>int</code> S IN天然（非Z字形）的顺序。
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</div>
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<dl>
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<dt>
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<span class="returnLabel">结果</span>
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</dt>
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<dd>
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当前量化表的副本。
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</dd>
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</dl> </li>
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</ul> <a name="getScaledInstance-float-boolean-">
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<!-- --> </a>
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<ul class="blockList">
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<li class="blockList"> <h4>getScaledInstance</h4> <pre>public <a href="../../../../javax/imageio/plugins/jpeg/JPEGQTable.html" title="class in javax.imageio.plugins.jpeg">JPEGQTable</a> getScaledInstance(float scaleFactor,
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boolean forceBaseline)</pre>
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<div class="block">
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<span>返回一个新的量化表，其中值乘以<code>scaleFactor</code> ，然后钳位到范围<code>forceBaseline</code> （如果<code>forceBaseline</code>为真，则为1..255）。</span>
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<p> <span><code>scaleFactor</code>小于1的值倾向于提高表的质量水平，而值大于1.0会降低表的质量水平。</span> </p>
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</div>
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<dl>
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<dt>
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<span class="paramLabel">参数</span>
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</dt>
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<dd>
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<code>scaleFactor</code> - 表的乘数。
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</dd>
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<dd>
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<code>forceBaseline</code> - 如果
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<code>true</code> ，值将被钳位到范围1..255
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</dd>
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<dt>
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<span class="returnLabel">结果</span>
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</dt>
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<dd>
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一个新的量化表，它是当前表的线性倍数。
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</dd>
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</dl> </li>
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</ul> <a name="toString--">
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<!-- --> </a>
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<ul class="blockListLast">
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<li class="blockList"> <h4>toString</h4> <pre>public <a href="../../../../java/lang/String.html" title="class in java.lang">String</a> toString()</pre>
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<div class="block">
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返回
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<code>String</code>表示此量化表。
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</div>
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<dl>
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<dt>
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<span class="overrideSpecifyLabel">重写：</span>
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</dt>
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<dd>
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<code><a href="../../../../java/lang/Object.html#toString--">toString</a></code>在
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<code><a href="../../../../java/lang/Object.html" title="class in java.lang">Object</a></code>
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</dd>
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<dt>
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<span class="returnLabel">结果</span>
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</dt>
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<dd>
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一个
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<code>String</code>表示此量化表。
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</dd>
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</dl> </li>
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</ul> </li>
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</ul> </li>
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</ul>
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</div>
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</div> |