import numpy as np

import cv2

img = np.zeros((3, 3), dtype=np.uint8)

print(img, img.dtype)

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

print(img, img.dtype, img.shape)

image = cv2.imread("img/1.jpg")

cv2.imwrite("img/1.png",image)

image = cv2.imread("img/1.jpg")

image[0:100,0:100] = [255,255,255]

cv2.imshow("Demo",image)

cv2.waitKey(0)

image = cv2.imread("img/1.jpg")

print(image.shape)

print(image.size)

print(image.dtype)

import numpy as np

import cv2

videoCapture = cv2.VideoCapture("img/小杰克的攻击.mp4")

fps = videoCapture.get(cv2.CAP_PROP_FPS)  # 获取每秒多少帧

size = (

    int(videoCapture.get(cv2.CAP_PROP_FRAME_WIDTH)),  # 获取视频帧宽度

    int(videoCapture.get(cv2.CAP_PROP_FRAME_HEIGHT))  # 获取视频帧高度

)

videoWriter = cv2.VideoWriter("output.avi", cv2.VideoWriter_fourcc('I', '', '', ''), fps, size)

success ,frame = videoCapture.read()

while success:

    videoWriter.write(frame)

    success,frame = videoCapture.read()