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我期望把截图放大之后，再找色。 我使用了images.resize来调整截图尺寸，然后对新的img对象，使用多点找色，发现报错了：Attempt to read from null array
但是把新尺寸图片先保持到本地，在通过read读取就没问题。 这是什么原因？