#改变图片像素值164-1；255-2；
from PIL import Image
import cv2
import os
# img = cv2.imread("F:/AI/glaucoma_set/gla_img_120_Chall/Annotation-Training400/Disc_Cup_Fovea_Illustration/g0001.jpg")
# img = cv2.imread("F:/AI/glaucoma_set/gla_img_120_Chall/Annotation-Training400/Disc_Cup_Masks/Non-Glaucoma_512/n0001.bmp",cv2.IMREAD_UNCHANGED)  # 读取系统的内照片def change_pixel(img):width = img.shape[0]  # 长度height = img.shape[1]  # 宽度for i in range(0, width):  # 遍历所有长度的点for j in range(0, height):  # 遍历所有宽度的点if (img[i, j ,0] != 0 or img[i ,j ,1] != 0 or img[i ,j ,2] != 0 ):img[i, j ,0] = 255img[i ,j ,1] = 255img[i ,j ,2] = 255return img
if __name__ =="__main__":filePath = 'D:\weldline\code\dataset\VOCdevkit_v3_61\VOC2012\SegmentationClass/'savePath = 'D:\weldline\code\dataset\VOCdevkit_v3_61\VOC2012\\new/'name = os.listdir(filePath)for i in name:image_path = os.path.join(filePath,i)image_save_Path = os.path.join(savePath,i)image = cv2.imread(image_path, cv2.IMREAD_ANYCOLOR)img = change_pixel(image)img = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)cv2.imwrite(image_save_Path, img)

·上面那段代码有的图像会报错，下面这个代码也可以实现，记录一下。

import cv2
import cv2 as cv#准备好需要替换颜色的图片yinzhang.jpg
img_rgb = cv2.imread('pictures/old/FeatureLocation5003.png')Conv_hsv_Gray = cv2.cvtColor(img_rgb, cv2.COLOR_BGR2GRAY)res, mask = cv2.threshold(Conv_hsv_Gray, 0, 255,cv2.THRESH_BINARY_INV |cv2.THRESH_OTSU)#255为需要保留的颜色（即不被替换的颜色），利用掩膜思想覆盖黑色部分
img_rgb[mask == 0] = [255, 255, 255]#cv2.imshow("imgOriginal", img_rgb) # show windows
cv2.imwrite('pictures/new/FeatureLocation5003.png', img_rgb, [int(cv2.IMWRITE_JPEG_QUALITY), 70])##cv2.imshow("mask", mask) # show windows#cv2.waitKey(0)