Python Tkinter將畫布另存爲使用PIL的圖像

Question

我有這段代碼可讓用戶在畫布上繪圖並將其保存爲jpeg文件。

正如在this post中提到的，我試着在畫布上和內存中使用PIL並行繪製，這樣我就可以將它保存爲jpeg而不是postscript。它似乎在工作，直到我發現我用PIL保存的一些圖像與畫布上繪製的圖像不一樣。

我假設canvas.create_line和draw.line從PIL圖像繪製模塊的功能類似，應該給出類似的輸出。

下面是什麼地方出了錯：

例如，當我畫一個「T」，它似乎好（左是我的畫，右邊是保存圖像）。

但是，當我畫一個 「A」，輸出圖像似乎有點不可思議。

這是我當前的代碼：

import Tkinter as tk 
import Image,ImageDraw 

class ImageGenerator: 
    def __init__(self,parent,posx,posy,*kwargs): 
     self.parent = parent 
     self.posx = posx 
     self.posy = posy 
     self.sizex = 200 
     self.sizey = 200 
     self.b1 = "up" 
     self.xold = None 
     self.yold = None 
     self.coords= [] 
     self.drawing_area=tk.Canvas(self.parent,width=self.sizex,height=self.sizey) 
     self.drawing_area.place(x=self.posx,y=self.posy) 
     self.drawing_area.bind("<Motion>", self.motion) 
     self.drawing_area.bind("<ButtonPress-1>", self.b1down) 
     self.drawing_area.bind("<ButtonRelease-1>", self.b1up) 
     self.button=tk.Button(self.parent,text="Done!",width=10,bg='white',command=self.save) 
     self.button.place(x=self.sizex/7,y=self.sizey+20) 
     self.button1=tk.Button(self.parent,text="Clear!",width=10,bg='white',command=self.clear) 
     self.button1.place(x=(self.sizex/7)+80,y=self.sizey+20) 

     self.image=Image.new("RGB",(200,200),(255,255,255)) 
     self.draw=ImageDraw.Draw(self.image) 

    def save(self): 
     print self.coords 
     self.draw.line(self.coords,(0,128,0),width=3) 
     filename = "temp.jpg" 
     self.image.save(filename) 

    def clear(self): 
     self.drawing_area.delete("all") 
     self.coords=[] 

    def b1down(self,event): 
     self.b1 = "down" 

    def b1up(self,event): 
     self.b1 = "up" 
     self.xold = None 
     self.yold = None 

    def motion(self,event): 
     if self.b1 == "down": 
      if self.xold is not None and self.yold is not None: 
       event.widget.create_line(self.xold,self.yold,event.x,event.y,smooth='true',width=3,fill='blue') 
       self.coords.append((self.xold,self.yold)) 

     self.xold = event.x 
     self.yold = event.y 

if __name__ == "__main__": 
    root=tk.Tk() 
    root.wm_geometry("%dx%d+%d+%d" % (400, 400, 10, 10)) 
    root.config(bg='white') 
    ImageGenerator(root,10,10) 
    root.mainloop() 

我去哪兒錯了，我應該怎麼做才能挽救被帆布爲JPEG圖像上繪製完全相同的畫面？

Answer 1

我設法解決了我的問題。實際上我只是啞巴。儘管canvas.create_line和draw.line具有類似的功能，但我並沒有使用相同的確切數據來繪製兩幅圖像。進行更改後，這是我的工作代碼。

import Tkinter as tk 
import Image,ImageDraw 

class ImageGenerator: 
    def __init__(self,parent,posx,posy,*kwargs): 
     self.parent = parent 
     self.posx = posx 
     self.posy = posy 
     self.sizex = 200 
     self.sizey = 200 
     self.b1 = "up" 
     self.xold = None 
     self.yold = None 
     self.drawing_area=tk.Canvas(self.parent,width=self.sizex,height=self.sizey) 
     self.drawing_area.place(x=self.posx,y=self.posy) 
     self.drawing_area.bind("<Motion>", self.motion) 
     self.drawing_area.bind("<ButtonPress-1>", self.b1down) 
     self.drawing_area.bind("<ButtonRelease-1>", self.b1up) 
     self.button=tk.Button(self.parent,text="Done!",width=10,bg='white',command=self.save) 
     self.button.place(x=self.sizex/7,y=self.sizey+20) 
     self.button1=tk.Button(self.parent,text="Clear!",width=10,bg='white',command=self.clear) 
     self.button1.place(x=(self.sizex/7)+80,y=self.sizey+20) 

     self.image=Image.new("RGB",(200,200),(255,255,255)) 
     self.draw=ImageDraw.Draw(self.image) 

    def save(self): 
     filename = "temp.jpg" 
     self.image.save(filename) 

    def clear(self): 
     self.drawing_area.delete("all") 
     self.image=Image.new("RGB",(200,200),(255,255,255)) 
     self.draw=ImageDraw.Draw(self.image) 

    def b1down(self,event): 
     self.b1 = "down" 

    def b1up(self,event): 
     self.b1 = "up" 
     self.xold = None 
     self.yold = None 

    def motion(self,event): 
     if self.b1 == "down": 
      if self.xold is not None and self.yold is not None: 
       event.widget.create_line(self.xold,self.yold,event.x,event.y,smooth='true',width=3,fill='blue') 
       self.draw.line(((self.xold,self.yold),(event.x,event.y)),(0,128,0),width=3) 

     self.xold = event.x 
     self.yold = event.y 

if __name__ == "__main__": 
    root=tk.Tk() 
    root.wm_geometry("%dx%d+%d+%d" % (400, 400, 10, 10)) 
    root.config(bg='white') 
    ImageGenerator(root,10,10) 
    root.mainloop()