pythonで図形をランダムに出力し画像ファイル作成

import cv2
import numpy as np
import random

width = 640
height = 480
padding = 40

# np.uint8  8bitの符号なし整数 0～255
img = np.zeros((height, width, 3), np.uint8)

for i in range(10):
    x = int(random.uniform(padding, width - padding))
    y = int(random.uniform(padding, height - padding))
    color1 = int(random.uniform(0, 255))
    color2 = int(random.uniform(0, 255))
    color3 = int(random.uniform(0, 255))
    hankei = int(random.uniform(10, 20))
    cv2.circle(img, (x, y), hankei, (color1, color2, color3), -1)

cv2.imshow("random_circle", img)

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

cv2.waitKey(0)
cv2.destroyAllWindows()