color_detection.py

import numpy as np
import argparse
import cv2

ap = argparse.ArgumentParser()
ap.add_argument("-i", "--image", required=True, help = "path to image")
args = vars(ap.parse_args())

image = cv2.imread(args["image"])

boundaries = [
    ([17, 15, 100], [50, 56, 200]),
    ([86, 31, 4], [220, 88, 50]),
    ([25, 146, 190], [62, 174, 250]),
    ([103, 86, 65], [145, 133, 128])
]

for (lower, upper) in boundaries:
    lower = np.array(lower, dtype = "uint8")
    upper = np.array(upper, dtype = "uint8")
    
    mask = cv2.inRange(image, lower, upper)
    output = cv2.bitwise_and(image, image, mask = mask)

    cv2.imshow("images", np.hstack([image, output]))
    cv2.waitKey(0)