python 生成png

python opencv生成背景透明图标_Tqdada的博客-CSDN博客

  

   

    

     

    
    

     

      import numpy as np
     
    
   

    

     

    
    

     

      import cv2
     
    
   

    

     

    
    

     

      import math
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      img = np.zeros((230,230), dtype=np.uint8)
     
    
   

    

     

    
    

     

      img = cv2.cvtColor(img, cv2.COLOR_GRAY2BGR)
     
    
   

    

     

    
    

     

      img[:,:,:] = 255
     
    
   

    

     

    
    

     

      #画星号，可以根据需要绘制其他形状
     
    
   

    

     

    
    

     

      #line1 0°
     
    
   

    

     

    
    

     

      color = (0,0,0)
     
    
   

    

     

    
    

     

      width = 55
     
    
   

    

     

    
    

     

      cv2.line(img, (115, 30), (115, 115), color, width)
     
    
   

    

     

    
    

     

      #line2 72°
     
    
   

    

     

    
    

     

      x2 = 115+85*math.sin(0.4*math.pi)
     
    
   

    

     

    
    

     

      y2 = 115-85*math.cos(0.4*math.pi)
     
    
   

    

     

    
    

     

      cv2.line(img, (115,115),(int(x2),int(y2)),color,width)
     
    
   

    

     

    
    

     

      #line3 -72°
     
    
   

    

     

    
    

     

      x3 = 230-int(x2)
     
    
   

    

     

    
    

     

      y3 = int(y2)
     
    
   

    

     

    
    

     

      cv2.line(img, (115,115), (x3,y3), color, width)
     
    
   

    

     

    
    

     

      #line4 144°
     
    
   

    

     

    
    

     

      x4 = 115+100*math.sin(0.2*math.pi)
     
    
   

    

     

    
    

     

      y4 = 115+100*math.cos(0.2*math.pi)
     
    
   

    

     

    
    

     

      cv2.line(img, (115,115), (int(x4),int(y4)), color, width)
     
    
   

    

     

    
    

     

      #line5 216°
     
    
   

    

     

    
    

     

      x5 = 230-int(x4)
     
    
   

    

     

    
    

     

      y5 = int(y4)
     
    
   

    

     

    
    

     

      cv2.line(img, (115,115), (x5,y5), color, width)
     
    
   

    

     

    
    

     

      #创建四通道图片
     
    
   

    

     

    
    

     

      b,g,r = cv2.split(img)
     
    
   

    

     

    
    

     

      a = np.ones(b.shape,dtype=b.dtype)*255
     
    
   

    

     

    
    

     

      for i in range(230):
     
    
   

    

     

    
    

     
    for j in range(230):
     
    
   

    

     

    
    

     
        if(b[i][j] == 255 and g[i][j] == 255 and r[i][j] == 255):
     
    
   

    

     

    
    

     

                  a[i][j] = 0
     
    
   

    

     

    
    

     

      img_al = cv2.merge((b,g,r,a))
     
    
   

    

     

    
    

     

      #查看保存图片
     
    
   

    

     

    
    

     

      cv2.imshow("img", img_al)
     
    
   

    

     

    
    

     

      cv2.imwrite("img.png", img_al)
     
    
   

    

     

    
    

     

      cv2.waitKey(0)
     
    
  
 

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版权声明：本文为CSDN博主「Tqdada」的原创文章，遵循CC 4.0 BY-SA版权协议，转载请附上原文出处链接及本声明。
原文链接：https://blog.csdn.net/Tqdada/article/details/105725007

文章来源: blog.csdn.net，作者：AI视觉网奇，版权归原作者所有，如需转载，请联系作者。

原文链接：blog.csdn.net/jacke121/article/details/124464529