python3 压缩图片到制定大小

code

import base64
import io
import os
from PIL import Image
from PIL import ImageFile
 
# 压缩图片文件
def compress_image(infile,outfile, mb=19, quality=3, k=0.5):
    """不改变图片尺寸压缩到指定大小
    :param outfile: 压缩文件保存地址
    :param mb: 压缩目标，KB
    :param step: 每次调整的压缩比率
    :param quality: 初始压缩比率
    :return: 压缩文件地址，压缩文件大小
    """
 
    o_size = os.path.getsize(infile) // 1024
    print(o_size, mb)
    if o_size <= mb:
        return outfile
    
    ImageFile.LOAD_TRUNCATED_IMAGES = True
    while o_size > mb:
        im = Image.open(infile)
        x, y = im.size
        out = im.resize((int(x*k), int(y*k)), Image.ANTIALIAS)
        try:
            out.save(outfile, quality=quality)
        except Exception as e:
            print(e)
            break
        o_size = os.path.getsize(outfile) // 1024
    return outfile
 
pwd=os.getcwd()
w_path=os.path.join(pwd,"pic")

target=os.path.join(pwd,"chr")

for i in os.listdir(w_path):
    if(not i.startswith(".")):
        f=os.path.join(w_path,i)
        tf=os.path.join(target,i)
        compress_image(f,tf)