DAY03/ex01.py

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+import numpy as np
+import cv2 
+import matplotlib.pyplot as plt
+# 加载图像
+img = cv2.imread("gpu.bmp")
+print(img)
+#img[0:100,200:500,:]=255 #对图像的连续块进行访问：获取数据，修改数据
+#plt.imshow(img)
+# 把图像的红色通道像素全部设置为0
+img[:,:,1:3][img[:,:,2] >= 0] = 0   #0:red 1:green  2:blue
+#cv2.imwrite("2.jpg",img)
+plt.imshow(img)
+plt.show()

ex01.py

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+import numpy
+import cv2
+img_array=[[[123,0,0,50] for i in range(300)]for j in range(260)]#255*255的图像，图像的像素[0,255,0,128]
+img_numpy=numpy.array(img_array)
+cv2.imwrite("1.jpg",img_numpy)