解决保存图片为空的错误

test/2024,9,23/mouse_event.py

@@ -1,21 +1,25 @@
+from pickletools import uint8
+
 import cv2 as cv
 import numpy as np
 
-img=np.ones((512,512))
+img = np.ones((512, 512, 3), dtype=np.uint8) * 255
+
+
+def draw_circle(event, x, y, flags, param):
+    if event == cv.EVENT_LBUTTONDOWN:
+        cv.circle(img, (x, y), 20, (0, 0, 0), -1)
 
-def draw_circle(event,x,y,flags,param):
-    if event==cv.EVENT_LBUTTONDOWN:
-        cv.circle(img,(x,y),20,0,-1)
 
 cv.namedWindow('show_img')
 
-cv.setMouseCallback('show_img',draw_circle)
-while(1):
-    cv.imshow('show_img',img)
-    pressedKey=cv.waitKey(5)
-    if pressedKey==ord('q'):
+cv.setMouseCallback('show_img', draw_circle)
+while (1):
+    cv.imshow('show_img', img)
+    pressedKey = cv.waitKey(5)
+    if pressedKey == ord('q'):
         break
-    elif pressedKey==ord('s'):
-        cv.imwrite("mouse_draw_circle.jpg",img);
+    elif pressedKey == ord('s'):
+        cv.imwrite("mouse_draw_circle.jpg", img);
         print("save success")
-cv.destroyAllWindows()
+cv.destroyAllWindows()