python学习笔记14 图像格式转换png转jpg

#Time:20181008 22:23
#将png图像转换为jpg
#form：https://blog.csdn.net/bevison/article/details/79126410?utm_source=copy

import os
import cv2
import sys
import numpy as np
# path = "F:\\ImageLib\\VRWorks_360_Video _SDK_1.1\\footage14\\"
path = "G:\\Python\\testproject1\\venv1\\neg"
print(path)
for filename in os.listdir(path):
    if os.path.splitext(filename)[1] == '.png':

         # print(filename)
         img = cv2.imread(path + filename)
         print(filename.replace(".png",".jpg"))
         newfilename = filename.replace(".png",".jpg")
         # cv2.imshow("Image",img)
         #  cv2.waitKey(0)
         cv2.imwrite(path + newfilename,img)

问题：

1、格式转换后图像信息丢失

2、怎么将转换后图像到文件夹中？