【单选题】【消耗次数：1】
色彩调整色阶命令中的灰色吸管的作用是？
①
设置图像的中性灰
②
设置图像的高光
③
设置图像的暗调
④
吸取颜色
参考答案：
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关于图像白点（白场）的设置，下列说法正确的是（ ）。
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选择工具箱中的吸管工具在图像的高光处单击
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选择工具箱中的颜色取样器工具在图像的高光处单击
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在Color Range（色彩范围）对话框中选择白色吸管工具并在图像的高光处单击
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