我有这个代码,让用户在画布上绘制并将其保存为jpeg文件.

正如在this post中所提到的,我尝试使用PIL在画布和内存中并行绘制,以便我可以将其保存为jpeg而不是postscript.它似乎工作,直到我发现我用PIL保存的一些图像与画布上绘制的图像不一样.

我假设来自PIL图像绘制模块功能的canvas.create_line和draw.line类似,并且应该给出类似的输出.

以下是出了什么问题：

例如,当我绘制“T”时,它似乎没问题(左边是我的绘图,右边是保存的图像).

但是当我绘制“A”时,输出图像看起来有点奇怪.

这是我目前的代码：

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("", self.motion)

self.drawing_area.bind("", self.b1down)

self.drawing_area.bind("", 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()

我哪里出错了,我应该怎么做才能保存画布上绘制的完全相同的图片作为jpeg图像？