图片颜色反转

实现原理是255-当前颜色值
灰度图片颜色反转实现代码如下：

import cv2
import numpy as np
img = cv2.imread('image1.jpg',1)
imgInfo = img.shape
height = imgInfo[0]
width = imgInfo[1]
gray = cv2.cvtColor(img,cv2.COLOR_BGR2GRAY)
dst = np.zeros((height,width,1),np.uint8)
for i in range(0,height):
    for j in range(0,width):
        grayPixel = gray[i,j]
        dst[i,j] = 255-grayPixel
cv2.imshow('dst',dst)
cv2.waitKey(0)

实现效果如图所示：
彩色图片颜色反转：

#彩色图片颜色反转
import cv2
import numpy as np
img = cv2.imread('image1.jpg',1)
imgInfo = img.shape
height = imgInfo[0]
width = imgInfo[1]
dst = np.zeros((height,width,3),np.uint8)
for i in range(0,height):
    for j in range(0,width):
        （b,g,r） = img[i,j]
        dst[i,j] = (255-b,255-g,255-r)
cv2.imshow('dst',dst)
cv2.waitKey(0)

实现效果如图：