python 调用第三方库压缩png或者转换成webp

因为工作需要去研究了下png的压缩，发现转换成webp可以小很多，但是webp在手机上的解码速度比png的解码速度慢很多。出于进几年手机设备的处理器的性能也不错了，所以准备两套方案。

在网上搜索了一些资料发现了http://www.linuxfromscratch.org/blfs/view/svn/general/libwebp.html这个和https://pngquant.org/这个。

恩，我不会说了，反正第三方库的网站在这了，参数什么的自己用help看。下面是我的代码：

1.png压缩

import os
import os.path

root_path = os.getcwd()+ os.sep
exe_path = "E:\workSpace\pngTest\pngquant.exe"

# full path
def check_file(file):
    dic = os.path.splitext(file)
    if dic[1] == ".png":
        return True
    return False

def is_file(path):
    return os.path.isfile(path)

def do_common(path):
    common = exe_path + " -f --quality 100 --ext .png --speed 1 " + path
    print("*" * 10 + "\n" + path)
    os.system(common)
    

def walk_dir():
    for root, dir_names, file_names in os.walk(root_path):
        for file_name in file_names:
            full_path = os.path.join(root, file_name)
            if is_file(full_path):
                if check_file(full_path):
                    do_common(full_path)
            else:
                walk_dir(full_path)

if __name__ == "__main__":
    walk_dir()

2：png转webp

import os
import os.path

root_path = os.getcwd()+ os.sep
exe_path = '''E:\workSpace\pngTest\webp\libwebp-0.3.1-windows-x64\cwebp.exe'''

# full path
def check_file(file):
    dic = os.path.splitext(file)
    if dic[1] == ".png":
        return True
    return False

def is_file(path):
    return os.path.isfile(path)

def do_common(path):
    dir_name = os.path.dirname(path)
    file = os.path.basename(path)
    dic = os.path.splitext(file)
    file_name = dic[0]
    file_out_name = file_name + "_webp"
    ext = dic[1]
    file_out = os.path.join(dir_name, file_out_name + ".webp")

    common = exe_path + " -preset drawing -q 100 -alpha_q 100 -quiet " + path + " -o " + file_out
    print("*" * 10 + "\n" + path)
    os.system(common)
    
    os.remove(path)
    print("#" * 10 + "\n" + file_out)
    os.rename(file_out, path)
    
    

def walk_dir():
    for root, dir_names, file_names in os.walk(root_path):
        for file_name in file_names:
            full_path = os.path.join(root, file_name)
            if is_file(full_path):
                if check_file(full_path):
                    do_common(full_path)
            else:
                walk_dir(full_path)

if __name__ == "__main__":
    walk_dir()

如果不符合你的需求，可以自己去改代码！

转载请注明出处