Count the number of pixels in a certain RGB range

colour_count.py

#!/usr/bin/env python

# Install OpenCV and numpy
# $ pip install opencv-python numpy

import cv2
import numpy as np

img = cv2.imread("bgr.png")
# minimum value of brown pixel in BGR order -> burleywood
BROWN_MIN = np.array([135, 184, 222], np.uint8)
# maximum value of brown pixel in BGR order -> brown
BROWN_MAX = np.array([42, 42, 65], np.uint8)

dst = cv2.inRange(img, BROWN_MIN, BROWN_MAX)
no_brown = cv2.countNonZero(dst)
print('The number of brown pixels is: ' + str(no_brown))
cv2.namedWindow("opencv")
cv2.imshow("opencv",img)
cv2.waitKey(0)

# vim: ft=python ts=4 sw=4 expandtab