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nodejs如何提取图片中不规则的一部分？

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nodejs如何提取图片中不规则的一部分？

前台传入图片的一些相对定点的pixel 坐标，如何根据这些坐标提取图片的某一些部分？
像 sharp gm 等 crop 功能都是根据矩形切割或者提取的，急，在线等大神。


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