功能:tiff转png。
THIK:图像的通道数视实际情况而定

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read_image (Image, 'C:/Users/19901/Desktop/DemoPic/HK-2D-1.tiff')

access_channel (Image, Image1, 1)
access_channel (Image, Image2, 2)

* write_image (Image1, 'png', 0, 'C:/Users/19901/Desktop/Height_0')
write_image (Image2, 'png', 0, 'C:/Users/19901/Desktop/Gray_0')