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<title>5.4. 亮度-对比度</title>
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<th colspan="3" align="center" id="chaptername">5.4. 亮度-对比度</th>
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<h3 class="title"><a id="gimp-tool-brightness-contrast"></a>5.4. 亮度-对比度</h3>
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亮度-对比度工具调整活动图层和选区的亮度和对比度。色阶和曲线工具更有效。
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要使用亮度-对比度工具可以通过图像菜单：<span class="guimenuitem">工具</span>/<span class="guimenuitem">颜色工具</span>/<span class="guimenuitem">亮度-对比度</span>。
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<span class="term">亮度</span>
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该滑条设定亮度，负值(变暗)，正值(变亮)。
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<span class="term">对比度</span>
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<dd>
<p>
该滑条设定对比度，负值(减少)，正值(增加)。
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<span class="term">预览</span>
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预览勾选框使任何对亮度和对比度的更改立即能看到。
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