需求，图片格式转换，从png转webp。扩展：用户可选缩放率。
核心方法在于：im.resize((w, h),Image.ANTIALIAS)
代码如下：
#!/usr/bin/python
# -*- coding: utf-8 -*-
import glob
import os
import threading
import sys
from Tkinter import *
from tkMessageBox import *
from PIL import Image
path = os.path.abspath(os.path.dirname(sys.argv[0]))
def select10():
successSelect(10)
def select20():
successSelect(20)
def select30():
successSelect(30)
def select40():
successSelect(40)
def select50():
successSelect(50)
def select60():
successSelect(60)
def select70():
successSelect(70)
def select80():
successSelect(80)
def select90():
successSelect(90)
def selectInput():
str = raw_input("请输入0～100的整数: ")
if str != "":
print str
if str.isdigit():
ratio = int(str)
successSelect(ratio)
selectInput()
else:
print "输入错误!"
selectInput()
else:
print "输入错误!"
selectInput()
def selectExit():
os._exit(0)
def successSelect(ratio):
if os.path.exists(path+'/img_bigger_%d' % ratio) == False:
os.mkdir(path+"/img_bigger_%d" % ratio)
if os.path.exists(path+'/img_smaller_%d' % ratio) == False:
os.mkdir(path+"/img_smaller_%d" % ratio)
if ratio < 0:
ratio = 0
if ratio > 100:
ratio = 100
index = 0
for infile in glob.glob(path+"/img/*.png"):
t = threading.Thread(target=create_image, args=(infile, ratio, index,))
t.start()
t.join()
index += 1
def create_image(infile, ratio, index):
os.path.splitext(infile)
im = Image.open(infile)
w,h = im.size
w = w*ratio//100
h = h*ratio//100
im = im.resize((w, h),Image.ANTIALIAS)
(filepath,tempfilename) = os.path.split(infile)
(filename,extension) = os.path.splitext(tempfilename)
fullpath = path+"/img/"+filename + ".webp"
im.save(fullpath, "WEBP")
sizeinfile = os.path.getsize(infile)
sizefullpath = os.path.getsize(fullpath)
if sizeinfile > sizefullpath:
im.save(path+"/img_smaller_%d/" % ratio+filename + ".webp", "WEBP")
else:
im.save(path+"/img_bigger_%d/" % ratio+filename + ".webp", "WEBP")
def start():
Button(text='10', command=select10).pack(fill=X)
Button(text='20', command=select20).pack(fill=X)
Button(text='30', command=select30).pack(fill=X)
Button(text='40', command=select40).pack(fill=X)
Button(text='50', command=select50).pack(fill=X)
Button(text='60', command=select60).pack(fill=X)
Button(text='70', command=select70).pack(fill=X)
Button(text='80', command=select80).pack(fill=X)
Button(text='90', command=select90).pack(fill=X)
Button(text='键盘输入', command=selectInput).pack(fill=X)
Button(text='退出', command=selectExit).pack(fill=X)
mainloop()
if __name__ == "__main__":
start()
demo 链接：https://github.com/licl19/pngToWebp.git