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  • python 图片处理

    项目中大量用到图片加载,由于图片太大,加载速度很慢,因此需要对文件进行统一压缩

    一:导入包

    from PIL import Image
    import os

    二:获取图片文件的大小

    def get_size(file):
        # 获取文件大小:KB
        size = os.path.getsize(file)
        return size / 1024

    三:拼接输出文件地址

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

    四:压缩文件到指定大小,我期望的是150KB,step和quality可以修改到最合适的数值

    def compress_image(infile, outfile='', mb=150, step=10, quality=80):
        """不改变图片尺寸压缩到指定大小
        :param infile: 压缩源文件
        :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 = 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)

    五:修改图片尺寸,如果同时有修改尺寸和大小的需要,可以先修改尺寸,再压缩大小

    def resize_image(infile, outfile='', x_s=1376):
        """修改图片尺寸
        :param infile: 图片源文件
        :param outfile: 重设尺寸文件保存地址
        :param x_s: 设置的宽度
        :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'D:learnspace.jpg')
        resize_image(r'D:learnspace.jpg')

    参考文档:

    1、Python实现图片压缩

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  • 原文地址:https://www.cnblogs.com/anovana/p/11176612.html
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