rgb to gray conversion opencv code example

Example 1: cv2 grayscale

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

Example 2: opencv grayscale to rgb

backtorgb = cv2.cvtColor(gray,cv2.COLOR_GRAY2RGB)

Example 3: convert image to grayscale opencv

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

Example 4: opencv rgb to gray custom

cv::transform(white_balance_image, i_test_base, cv::Matx13f(0.114, 0.587, 0.299));