判断图片通道数及图片三通道转单通道方法

判断图片通道数

 from PIL import Image
 img=Image.open('image_test/1.png')
 print(len(img.split()))

三通道转单通道

简化版：

 import cv2
 ​
 img = cv2.imread('01.png', cv2.IMREAD_GRAYSCALE)
 cv2.imwrite("001.png", img)

批量处理完整版：

##修改图片通道
 path = "E:\\桌面\\te\\image_3_new"
 image_all = os.listdir(path)
 for item in image_all:
     dir_all = os.path.join(path, item)
     # print(dir_all)
     name = dir_all.split("\\")[-1]
     path1 = "image_3_new" + "/" + name  
     img = cv2.imread(path1, cv2.IMREAD_GRAYSCALE)  ##注意cv2.imread（）里边的路径是相对路径
     cv2.imwrite("image_1" + "/" + name, img)
 

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