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不要每一次都转pgm
没看懂问题，如果不想手动转pgm，OpenMV可以直接img.save("t.pgm")就可以保存。
如果不想保存，也可以在img上crop，因为模版就是普通的Image对象。注意copy=True
https://docs.singtown.com/micropython/zh/latest/openmvcam/library/omv.image.html#image.Image.image.crop