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<ul class="navigation"><li class="prev"><a accesskey="p" class="prev" href="WSfd1234e1c4b69f30ea53e41001031ab64-7939a.html" title="更改图像的像素大小"><img src="images/blank.gif" alt="上一页" width="17" height="17" /></a></li><li class="next"><a accesskey="n" class="next" href="WSfd1234e1c4b69f30ea53e41001031ab64-7934a.html" title="确定建议使用的图像分辨率"><img src="images/blank.gif" alt="下一页" width="17" height="17" /></a></li></ul><div class="hierarchy"><a href="WSfd1234e1c4b69f30ea53e41001031ab64-794aa.html">打开和导入图像</a> /
     <a href="WSfd1234e1c4b69f30ea53e41001031ab64-7945a.html"><b>图像大小和分辨率</b></a> 
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                    更改打印尺寸和分辨率
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                <div><div class="section"><p>创建用于打印介质的图像时，根据打印尺寸和图像分辨率指定图像大小非常有用。这两个属性的数值（称为<dfn class="term">文档大小</dfn>）决定了像素总数，因而也决定了图像的文件大小；文档大小还决定了将图像放入其它应用程序中时的基本大小。还可以使用“打印”命令来进一步处理打印图像的缩放；但使用“打印”命令所做的更改只影响打印后的图像，而不会影响图像文件的文档大小。</p>
<p>如果为图像启用重新取样，则可以独立地更改打印尺寸和分辨率（并更改图像中的像素总量）。如果关闭重新取样，则可以更改尺寸或分辨率，Photoshop 自动调整另一个值以保持像素总量不变。为了获得最高的打印品质，一般来说，最好先更改尺寸和分辨率，而不重新取样。然后，只是在需要时才重新取样。</p>
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<ol><li class="stepexpand"><span>选取“图像”&gt;“图像大小”。</span></li>
<li class="stepexpand"><span>更改打印尺寸或图像分辨率，或者同时更改两者：</span><ul><li><p>要只更改打印尺寸或分辨率并按比例调整图像中的像素总数，请选择“重定图像像素”并选取一种插值方法。 </p>
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<li><p>要更改打印尺寸和分辨率而又不更改图像中的像素总数，请取消选择“重定图像像素”。</p>
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<li class="stepexpand"><span>要保持图像当前的宽高比例，请选择“约束比例”。更改高度时，该选项自动更改宽度，反之亦然。</span></li>
<li class="stepexpand"><span>在“文档大小”下输入新的高度值和宽度值。如果需要，请选取一个新的度量单位。注意，对“宽度”而言，“列”选项使用在“单位和标尺”首选项中指定的宽度和装订线尺寸。</span></li>
<li class="stepexpand"><span>对于“分辨率”，输入一个新值。如果需要，请选取一个新的度量单位。</span> <div class="tip"><img src="images/tip_help.png" />要恢复“图像大小”对话框中显示的初始值，请按住 Alt 键 (Windows) 或 Option 键 (Mac OS)，然后单击“复位”。</div></li>
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                    <div><p><a href="WSfd1234e1c4b69f30ea53e41001031ab64-77a9a.html">定位和缩放图像</a></p><p><a href="WSfd1234e1c4b69f30ea53e41001031ab64-77aea.html">打印图像</a></p><p><a href="WSfd1234e1c4b69f30ea53e41001031ab64-74c8a.html">指定图像的列</a></p>
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