How to find Hue value of an Image and use it to apply on other images of similar kind?-CodePudding

I'm trying to replace color of an object in an image. Suppose if I want to replace the color in the below image object to the color in the below image object

I change this color using CAD tool, I want to achieve this using python code I'm replacing HUE color of an Image as below code

import cv2
import numpy as np

# read image
img = cv2.imread(r"C:\Research\Replace_colors\Bright\Test\b2\img_1_2_pid_13_group_18_P50_A174.png")

# convert img to hsv
hsv = cv2.cvtColor(img, cv2.COLOR_BGR2HSV)
h = hsv[:,:,0]
s = hsv[:,:,1]
v = hsv[:,:,2]

# shift the hue
# cv2 will clip automatically to avoid color wrap-around
huechange = 10   # 0 is no change; 0<=huechange<=180
hnew = cv2.add(h, huechange)

# combine new hue with s and v
hsvnew = cv2.merge([hnew,s,v])

# convert from HSV to BGR
result = cv2.cvtColor(hsvnew, cv2.COLOR_HSV2BGR)

# save result
cv2.imwrite('result.png', result)

I was able to get color close to my required color but not exact color as I wanted

How can I change HUE value so I can replace color exactly ??

Any help or suggestion on this will be very helpful

CodePudding user response：

Are you sure you are using the right value for huechange and you don't need to change the value channel? When I use a color picker on the large flat part to the top right I get the following HSV values:

Original: (51, 100%, 56.1%)

Modified: (70, 100%, 56.1%)

Desired: (60, 100%, 28.2%)