第五步：现在转到在工具栏，选取历史记录画笔工具(红圈的那个)。
Step 5: Trot over to the toolbar and grab the History Brush (circled in red below).
(正如其名历史记录画笔)实际上我们需要使用蒙版，以便重现源文件的色彩效果。
In effect, we're going to paint a mask that allows the original history state (that of having color) to show back through.
(正如其名历史记录画笔)实际上我们需要使用蒙版，以便重现源文件的色彩效果。
In effect, we're going to paint a mask that allows the original history state (that of having color) to show back through.
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