这篇教程python 实现图片格式的批量转化，jpg转化为png或者png转化为jpg写得很实用，希望能帮到您。
"""
先来说一下jpg图片和png图片的区别
jpg格式:是有损图片压缩类型,可用最少的磁盘空间得到较好的图像质量
png格式:不是压缩性,能保存透明等图
"""
from PIL import Image
import cv2 as cv
import os
def PNG_JPG(PngPath):
img = cv.imread(PngPath, 0)
w, h = img.shape[::-1]
infile = PngPath
outfile = os.path.splitext(infile)[0] + ".jpg"
img = Image.open(infile)
img = img.resize((int(w / 2), int(h / 2)), Image.ANTIALIAS)
try:
if len(img.split()) == 4:
# prevent IOError: cannot write mode RGBA as BMP
r, g, b, a = img.split()
img = Image.merge("RGB", (r, g, b))
img.convert('RGB').save(outfile, quality=70)
os.remove(PngPath)
else:
img.convert('RGB').save(outfile, quality=70)
os.remove(PngPath)
return outfile
except Exception as e:
print("PNG转换JPG 错误", e)
if __name__ == '__main__':
PNG_JPG(r"C:\Users\lenovo\Desktop\newI\s.png")
PIL安装失败是因为python版本不对，python3 使用pip install pillow
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