from PIL import Image
import os

def get_size(file):
    # 獲取檔案大小:KB
    size = os.path.getsize(file)
    return size / 1024


def get_outfile(infile, outfile):
    if outfile:
        return outfile
    dir, suffix = os.path.splitext(infile)
    outfile = '{}-out{}'.format(dir, suffix)
    return outfile


 
def compress_image(infile, outfile='', mb=150, step=10, quality=80):
    """不改變圖片尺寸壓縮到指定大小
    :param infile: 壓縮原始檔
    :param outfile: 壓縮檔案儲存地址
    :param mb: 壓縮目標，KB
    :param step: 每次調整的壓縮比率
    :param quality: 初始壓縮比率
    :return: 壓縮檔案地址，壓縮檔案大小
    """
    o_size = get_size(infile)
    if o_size <= mb:
        
 
return infile
    outfile = get_outfile(infile, outfile)
    while o_size > mb:
        im = Image.open(infile)
        im.save(outfile, quality=quality)
        if quality - step < 0:
            break
        quality -= step
        o_size = get_size(outfile)
    return outfile, get_size(outfile)


 
def resize_image(infile, outfile='', x_s=1376):
    """修改圖片尺寸
    :param infile: 圖片原始檔
    :param outfile: 重設尺寸檔案儲存地址
    :param x_s: 設定的寬度
    :return:
    """
    im = Image.open(infile)
    x, y = im.size
    y_s = int(y * x_s / x)
    out = im.resize((x_s, y_s), Image.ANTIALIAS)
    outfile = get_outfile(infile, outfile)
    out.save(outfile)


if __name__ == '__main__':
    compress_image(r'./3.jpg')
    resize_image(r'11.jpg')