How do I change the color extracted image to the same color with Python OpenCV?

Question

I extracted green color in image with cv2.inRange().

But, The colors of the extracted images were all different.

like this --> enter image description here

I want to change extracted image's color to same.

Please help me....

This is my code.

import numpy as np
import cv2

img = cv2.imread('test_img.jpg')
height, width = img.shape[:2] 
   
img_hsv = cv2.cvtColor(img, cv2.COLOR_BGR2HSV) 
    
lower_green = (35,45,0,0) 
upper_green = (80, 255, 255,0) 
img_mask = cv2.inRange(img_hsv, lower_green, upper_green)
img_result = cv2.bitwise_and(img, img, mask = img_mask) 

cv2.imshow('color',img_result)

Output

enter image description here

Answer 1

You need to zero the B and R dimensions of the image, as follows:

import numpy as np
import cv2

img = cv2.imread('test_img.jpg')
height, width = img.shape[:2] 
   
img_hsv = cv2.cvtColor(img, cv2.COLOR_BGR2HSV) 
    
lower_green = (35,45,0,0) 
upper_green = (80, 255, 255,0) 
img_mask = cv2.inRange(img_hsv, lower_green, upper_green)
img_result = cv2.bitwise_and(img, img, mask = img_mask)[:, :, 1]

img[:, :, 0] = 0
img[:, :, 2] = 0
img[:, :, 1] = img_result

cv2.imshow('color', img)
cv2.waitKey(0)

or if you want a simpler way to output the image, you can use the matplotlib.pyplot, as follows:

import matplotlib.pyplot as plt

plt.imshow(img)

Cheers