[OpenCV] 이미지 내 특정 컬러 변경(글자 색 바꾸기)

이미지 내 특정 색을 다른 색으로 변경하고 싶을 때

 

출처 : https://stackoverflow.com/questions/62648862/how-can-i-change-the-hue-of-a-certain-area-with-opencv-python

How can I change the hue of a certain area with OpenCV-Python

 

상단 코드를 참조한 예제코드

import cv2
import numpy as np

# load image with alpha channel
img = cv2.imread('./black_image.jpg', cv2.IMREAD_COLOR)
img = cv2.cvtColor(img, cv2.COLOR_BGR2RGB)
# extract bgr channels
bgr = img[:,:,0:3]

# select grayscale range
mask = cv2.inRange(bgr, (190,190,190), (255,255,255))

# change the image to make it green where the mask is white
bgr_new = bgr.copy()

# BGR이라서 255, 0, 0
bgr_new[mask!=255] = (255,0,0)

# save output
cv2.imwrite('bgr_new.png', bgr_new)