linux粘贴文本格式错乱：
vi/vim

:set paste

然后再 insert ，粘贴

centos安装pillow图像处理库：
引用：https://blog.csdn.net/newbieLCQ/article/details/125345335

linux赋予执行权限：

# 创建文件
touch comperss.py
# 赋予权限
chmod +x compress.py

png使用pillow报错，不知道为什么，， 后面使用的pngquant。。

# 安装pngquant
brew install pngquant
# 测试图片压缩，，  quality 参数格式是min-max ，， 其中min：是最小质量值，max是最大质量值，，较低的min会更大的压缩和更低的质量，较高的max会保留更多的图像质量
pngquant --quality=10-30 --output output.png --force --verbose 222.png

import os
import subprocess
from PIL import Image, ImageFile

# 允许加载截断的图像文件
ImageFile.LOAD_TRUNCATED_IMAGES = True

def compress_image(input_path, output_path, target_size_kb, min_quality=1, max_quality=95):
    target_size_bytes = target_size_kb * 1024

    with Image.open(input_path) as img:
        img_format = img.format

        low = min_quality
        high = max_quality
        best_quality = low

        while low <= high:
            mid = (low + high) // 2
            img.save(output_path, format=img_format, quality=mid, optimize=True)
            output_size = os.path.getsize(output_path)

            if output_size <= target_size_bytes:
                best_quality = mid
                low = mid + 1
            else:
                high = mid - 1

        img.save(output_path, format=img_format, quality=best_quality, optimize=True)
        return best_quality

def compress_image_in_directory(directory, target_size_kb=50):
    for root, _, files in os.walk(directory):
        for filename in files:
            if filename.lower().endswith(('.jpg', '.jpeg', '.bmp', '.gif')):
                input_path = os.path.join(root, filename)
                output_path = os.path.join(root, f"{filename}")
                final_quality = compress_image(input_path, output_path, target_size_kb)
                print(f"{filename}_final quality is {final_quality}")
            elif filename.lower().endswith('.png'):
                input_path = os.path.join(root, filename)
                output_path = os.path.join(root, f"f_{filename}")
                final_quality = compress_image_png(input_path, output_path, target_size_kb)
                print(f"{filename}_final quality is {final_quality}")

def compress_image_png(input_path, output_path, target_size_kb=50, min_quality=1, max_quality=95):
    target_size_bytes = target_size_kb * 1024
    with Image.open(input_path) as img:
        img_format = img.format
        if img_format.lower() == 'png':
            success = compress_png_with_pngquant(input_path, output_path, target_size_kb)
            # if success:
            #     return "pngquant"
            # else:
            #     for compress_level in range(10, 0, -1):
            #         img.save(output_path, format=img_format, compress_level=compress_level)
            #         output_size = os.path.getsize(output_path)
            #         if output_size <= target_size_bytes:
            #             return compress_level
            #     img.save(output_path, format=img_format, optimize=True, compress_level=compress_level)
            #     return 1
            return "success"

def compress_png_with_pngquant(input_path, output_path, target_size_kb):
    target_size_bytes = target_size_kb * 1024
    # quality设置压缩，， 为1:压缩到最小
    command = ['pngquant', '--quality=1', '--output', output_path, '--force', '--', input_path]
    try:
        subprocess.run(command, check=True)
        output_size = os.path.getsize(output_path)
        return output_size <= target_size_bytes
    except subprocess.CalledProcessError as e:
        print(f"Error during pngquant compression: {e}")
        return False
    except FileNotFoundError as e:
        print(f"pngquant not found: {e}")
        return False

# 示例：指定目录路径
directory_path = '/Users/chenjie/code/python-learn/python410/img'  # 替换为你的图片目录路径
compress_image_in_directory(directory_path)