Implement Color Detection with Example in Python OpenCV

In this tutorial, we will use an example to show you how to detect a color from an image in python opencv.

Best Practice to Implement Color Detection with Example in Python OpenCV

We will detect the green color in this example.

1.Read an image

import cv2
import numpy as np
img = cv2.imread("pydetect.png")

2.Convert rgb image to hsv

hsv_img = cv2.cvtColor(img, cv2.COLOR_BGR2HSV)

Here is an detailed tutorial:

Convert an Image to HSV Using Python OpenCV

3.Create a NumPy array for the lower green values and the upper green values

lower_green = np.array([34, 177, 76])
upper_green = np.array([255, 255, 255])

4.Use cv2.inRange() to get color mask

masking = cv2.inRange(hsv_img, lower_green, upper_green)

5.Get the masked image

cv2.imshow("Green Color detection", masking)
cv2.waitKey(0)

If you want to save the resultant image, you can refer this tutorial:

Save an Image in Python OpenCV

Implement Color Detection with Example in Python OpenCV