python批量压缩图片并输出日志

from PIL import Image
import os
import logging
from datetime import datetime

def resize_and_compress_images(input_folder, quality=85, size_threshold_kb=300, max_width=1000):
    # 设置日志
    log_file = f"compression_log_{datetime.now().strftime('%Y%m%d%H%M%S')}.txt"
    logging.basicConfig(filename=log_file, level=logging.DEBUG, format='%(asctime)s - %(levelname)s - %(message)s')

    # 统计信息
    total_images = 0
    compressed_images = 0

    for root, dirs, files in os.walk(input_folder):
        for image_file in files:
            total_images += 1
            input_path = os.path.join(root, image_file)

            try:
                # 获取图片文件大小
                file_size_kb = os.path.getsize(input_path) / 1024

                # 仅当图片大小大于300KB时进行压缩
                if file_size_kb > size_threshold_kb:
                    # 打开图片
                    img = Image.open(input_path)

                    # 调整宽度为最大值1000像素
                    if img.width > max_width:
                        ratio = max_width / float(img.width)
                        new_height = int(float(img.height) * float(ratio))
                        img = img.resize((max_width, new_height), Image.ANTIALIAS)

                    # 覆盖保存为JPEG或PNG格式，根据文件类型设置相应的参数
                    if image_file.lower().endswith(('.jpg', '.jpeg')):
                        img.save(input_path, 'JPEG', quality=quality, optimize=True)
                    elif image_file.lower().endswith('.png'):
                        img.save(input_path, 'PNG', optimize=True)

                    compressed_images += 1
                    logging.info(f"成功压缩图片: {input_path}")
                else:
                    logging.info(f"跳过小于{size_threshold_kb}KB的图片: {input_path}")
            except Exception as e:
                logging.error(f"压缩图片时发生错误: {input_path}. 错误信息: {str(e)}")

    # 记录统计信息
    logging.info(f"总共图片数: {total_images}")
    logging.info(f"成功压缩图片数: {compressed_images}")

    # 输出日志文件路径
    print(f"日志文件路径: {os.path.abspath(log_file)}")

if __name__ == "__main__":
    # 输入文件夹（包含待压缩的JPEG和PNG图片）
    input_folder = "input_images"

    # 设置压缩质量（仅适用于JPEG，0-100，100为最高质量）
    compression_quality = 85

    # 设置图片大小阈值（大于该阈值才进行压缩）
    size_threshold_kb = 300

    # 设置最大宽度
    max_width = 1000

    # 执行图片压缩（直接覆盖原文件）
    resize_and_compress_images(input_folder, quality=compression_quality, size_threshold_kb=size_threshold_kb, max_width=max_width)

    print("图片压缩完成。日志文件详见压缩日志。")