Python数据处理从零开始----第四章（可视化）（15）制作签名

 # In[*]
%clear
%reset -f
# In[*]
import cv2
import  os
os.chdir('D:\\data\\pic')
image = cv2.imread(r'chenzihao.jpg',cv2.IMREAD_UNCHANGED)
 # In[*]
size =  image.shape
  # In[*]
print (size,image[0][0])
   # In[*]
for i in range(size[0]):
    for j in range(size[1]):
        if image[i][j][0]>100 and image[i][j][1]>100 and image[i][j][2]>100:
           image[i][j][3] = 0
        else:
            image[i][j][0],image[i][j][1],image[i][j][2] = 0,0,0
 
   # In[*]
 
cv2.imwrite(r'chenzihao.png',image)