如何批量去除PDF扫描件中的黑边、杂点、阴影？ - 知乎
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第一种，利用修图软件。 因为扫描后的PDF文件是图片型PDF，简单来说就是图片文件，可以直接导入到Photoshop打开，然后利用修补或者是橡皮擦，来将那些黑点去掉。 不过字迹不清晰的话，倒是没有很好的办法，只能利用锐化滤镜来调整了。 第二种，利用PDF编辑器。
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