Python Tkinter使用PIL将画布另存为图像 [英] Python Tkinter save canvas as image using PIL
问题描述
我有这段代码,可以让用户在画布上绘制并将其另存为jpeg
文件.
I have this code which lets the user draw on the canvas and save it as a jpeg
file.
如这篇文章中所述,我尝试使用PIL在画布上和内存中并行绘制,以便我可以将其另存为jpeg
而不是postscript
.直到我发现用PIL保存的某些图像与在画布上绘制的图像不同之前,这种方法似乎一直有效.
As mentioned in this post, I tried to draw in parallel on the canvas and in memory using the PIL so that I can save it as a jpeg
instead of postscript
. It seemed to be working until I found out that some of the images I saved with PIL are not the same as what was drawn on the canvas.
我假设PIL图像绘制模块中的canvas.create_line
和draw.line
具有相似的功能,并且应该提供相似的输出.
I assume canvas.create_line
and draw.line
from the PIL image draw module function similarly and should give similar output.
以下是哪里出了问题:
例如,当我绘制"T"时,看起来还不错(左是我的图,右是保存的图像).
For example, when I draw a "T" it seems alright (Left is my drawing, right is the saved image).
但是当我画一个"A"时,输出图像看起来有点奇怪.
But when I draw an "A" , the output image seems a bit weird.
这是我当前的代码:
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("<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()
我哪里出错了,应该怎么做才能将画布上绘制的完全相同的图片另存为jpeg图像?
Where did I go wrong and what should I do to save the exact same picture that is drawn on the canvas as a jpeg image?
推荐答案
我设法解决了我的问题.实际上我只是傻瓜.即使canvas.create_line
和draw.line
具有相似的功能,我也没有使用相同的确切数据绘制两个图像.进行更改后,这是我的工作代码.
I managed to solved my problem.In fact i was just being dumb. Even though canvas.create_line
and draw.line
have the similar function, i didn't use the same exact data to draw out both images. after making changes, this is my working code.
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()
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