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import os
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from PIL import Image
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# 对图片进行压缩,实测JPG图片，从100%到85%,体积从159K压缩到75K效果明显，但PNG图片，从739K压缩到729K，基本无变化
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def compress_img(source, target):
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cmd = '"C:\\Program Files\\ImageMagick-7.1.1-Q16\\magick.exe" ' + source + ' -quality 85 ' + target
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os.system(cmd)
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# 获取竖版4：3的图像
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def get4to3img(filename, out):
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# 打开图片
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img = Image.open(filename)
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# 获取原始尺寸
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original_width, original_height = img.size
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# 目标高宽比
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target_ratio = 4 / 3
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# 计算目标高度，使得高度是宽度的4/3倍
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target_height = int(original_width * target_ratio)
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# 如果原始高度小于目标高度，需要在顶部和底部添加空间
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if original_height < target_height:
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# 创建一个新的画布，高度为目标高度，宽度保持不变
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new_img = Image.new('RGB', (original_width, target_height), 'white')
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# 计算附加空间的位置
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pad_top = (target_height - original_height) // 2
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# 将原始图片粘贴到新画布的中心
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new_img.paste(img, (0, pad_top))
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img = new_img
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new_img.close()
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# 如果原始高度大于目标高度，需要裁剪图片
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elif original_height > target_height:
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# 计算裁剪的起始点
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crop_top = (original_height - target_height) // 2
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crop_bottom = original_height - crop_top
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# 裁剪图片
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img = img.crop((0, crop_top, original_width, crop_bottom))
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# 保存调整后的图片
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img.save(out)
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# 关闭图片，释放内存
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img.close()
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if __name__ == '__main__':
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# 图片路径
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filename = r'D:\backup\021d1281-9d0b-3acf-fc8b-1b86ff6e9832.jpg'
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get43img(filename, r'D:\backup\021d1281-9d0b-3acf-fc8b-1b86ff6e9832_222.jpg')
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