cv2 gray code example

Example 1: cv2 grayscale

gray = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)

Example 2: convert image to grayscale opencv

img_gray_mode = cv2.imread(path, cv2.IMREAD_GRAYSCALE)

Example 3: cvtcolor rgb to gray

cv::Mat img
cv::cvtColor(img, img, CV_BGR2GRAY);