python把图片变成素描样子

import tkinter as tk
from tkinter import *
from tkinter import filedialog, messagebox
from PIL import Image, ImageFilter, ImageOps, ImageTk
realPath = ""

def selectPicture():
    global realPath
    
    root = tk.Tk()
    root.withdraw()
    Fpath = filedialog.askopenfilename() #我们选择的图片的路径
    path.set(Fpath)    #把路径信息写到文本框中
    realPath = Fpath   #更新我们的路径

def dodge(a, b, alpha):
    return min(int(a*255/(256-b*alpha)),255)

def draw(blur=25):
    
    img = Image.open(realPath)
    LastIndex = realPath.rfind('.')     #后缀里面的.出现的位置
    FevalPath = realPath[: LastIndex]   #保存时需要把后缀除去，加上  sumiao.png
    
    alpha = scale1.get()
    alpha = float(alpha)
    
    img1 = img.convert('L')   #调用Image模块里面的convert函数将图片转换成灰色
    img2 = img1.copy()
    img2 = ImageOps.invert(img2)
    for i in range(blur):   #模糊度
        img2 = img2.filter(ImageFilter.BLUR)
    width, height = img1.size
    for x in range(width) :
        for y in range( height):
            a = img1.getpixel((x, y))
            b = img2.getpixel((x, y))
            img1. putpixel((x, y), dodge(a, b, alpha))
    img1.show()
    img1.save(FevalPath + 'sumiao.png')
    
def closeWindow():
    window.destroy()     # destroy是注销
    sys.exit(0)   #退出进程
    
def getValue(self):
    val = scale1.get()   #得到滑块的值
    value.set(str(val))  #将其送到后面文本框中显示
    
#draw(img)


window = Tk()  # Tk是一个类
window.title("图片转为素描")   # 窗口标题
window.geometry('480x230')    # 窗口大小
window.geometry('+500+240')   # 窗口位置

path = StringVar()  #似乎可编辑文本框的必须是这个类型才可以用set,有待查找资料
Label(window,text ="目标路径：").grid(row = 0, column = 0)
Entry(window, text = path,width=40).grid(row = 0, column = 1)  #可编辑文本

#设置滑动条
Label(window,text ="模糊程度：").grid(row = 1, column = 0)  #设置标签
scale1 = tk.Scale(window, from_=0, to=1.0, orient=tk.HORIZONTAL,resolution=0.01,show=0,command=getValue,  length=200)
scale1.grid(row=1, column=1)
value =StringVar()  
scale1.set(0.93)   #设置默认值

Entry(window, text = value,width=10).grid(row = 1, column = 2)  #可编辑文本

# 按钮控制，command作为点击触发的事件
btn = Button(window, text="选择图片",width=10, height=1,command=selectPicture)   #第一个按钮
btn.grid(row=0, column=2)
btn1 = Button(window, text="开始转换", width=10, height=1, command=draw)  #第二个按钮
btn1.grid(row=2, column=1)
btn2 = Button(window, text="退出", width=10, height=1, command=closeWindow)  #第三个按钮
btn2.grid(row=2, column=2, sticky=E, padx=7)

window.protocol("WM_DELETE_WINDOW", closeWindow)   # protocol()  用户关闭窗口触发的事件
window.mainloop()   # 显示窗口，也叫消息循环

本来想上传视频的，但是发现不可以上传，我上传一张图片吧，这个效果大概是这样