用python 将蓝底照片转化为白底照片

# coding=utf-8
import cv2
import  numpy as np

img=cv2.imread('picture.jpg')  #原始图片
#缩放
rows,cols,channels = img.shape
img=cv2.resize(img,None,fx=0.5,fy=0.5)
rows,cols,channels = img.shape
#cv2.imshow('img',img)

#转换hsv
hsv=cv2.cvtColor(img,cv2.COLOR_BGR2HSV)
lower_blue=np.array([90,150,170])#调整这些参数，以适应你的图片
upper_blue=np.array([110,255,255])#
mask = cv2.inRange(hsv, lower_blue, upper_blue)
cv2.imshow('Mask', mask)

#腐蚀膨胀
#erode=cv2.erode(mask,None,iterations=1)
#cv2.imshow('erode',erode)
#dilate=cv2.dilate(erode,None,iterations=1)
#cv2.imshow('dilate',dilate)

#遍历替换
for i in range(rows):
    for j in range(cols):
        if mask[i,j]==255:
            img[i,j]=(255,255,255)#此处替换颜色，为BGR通道

cv2.imwrite('new1_picture.jpg',img) #生成的新图片

cv2.waitKey(0)
cv2.destroyAllWindows()

转自 https://blog.csdn.net/xiangxianghehe/article/details/78581230