为什么OpenCV不使用Python的CV2给这个矩形一个颜色

Question

The following code draws a white rectangle. However it is not supposed to do that. Considering opencv uses BGR colorspace, it should look like this http://www.colorpicker.com/?colorcode=9F635F

import cv2
import numpy as np

drawing = np.zeros([500, 500, 3])
cv2.rectangle(drawing, (0, 0), (250, 250), (95, 99, 159), -1)
cv2.imshow("drawing", drawing)
cv2.waitKey()

Answer 1

It will draw fine if you change

drawing = np.zeros([500, 500, 3])

to

drawing = np.zeros([500, 500, 3], np.uint8)

Otherwise, the image will be of 32F type.

Answer 2

只是猜测，但这与默认为灰度的“绘图”参数有关吗？