[英]Python Tkinter save canvas as image using PIL
我有这段代码,它允许用户在画布上绘制并将其保存为jpeg
文件。
正如这篇文章中提到的,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
。 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同之前,它似乎一直在工作。
我认为canvas.create_line
和draw.line
从PIL图像绘制类似的模块功能,并应给予相似的输出。
下面是出错的地方:
例如,当我画一个“T”时,它看起来没问题(左边是我的画,右边是保存的图像)。
但是当我画一个 "A" 时,输出图像似乎有点奇怪。
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,我应该怎么做才能将画布上绘制的完全相同的图片保存为 jpeg 图像?
我设法解决了我的问题。事实上我只是愚蠢。 尽管canvas.create_line
和draw.line
有类似的功能,我没有使用完全相同的数据绘制出两个图像。 在进行更改后,这是我的工作代码。
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.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()
对鼠标事件稍作改动
"""
画板,鼠标移动速度太快可以造成不连续的点
tkinter 8.6.11
https://stackoverflow.com/questions/17915440/python-tkinter-save-canvas-as-image-using-pil
"""
import tkinter as tk
from PIL import Image, ImageDraw
class ImageGenerator:
def __init__(self, parent, posx, posy, *kwargs):
self.parent = parent
self.posx = posx
self.posy = posy
self.sizex = 280
self.sizey = 280
self.penColor = "white" # 画笔的颜色 (255, 255, 255)
self.backColor = "black" # 画布背景色 (0, 0, 0)
self.penWidth = 10 # 笔刷的宽度
self.drawing_area = tk.Canvas(
self.parent, width=self.sizex, height=self.sizey, bg=self.backColor
)
self.drawing_area.place(x=self.posx, y=self.posy)
self.drawing_area.bind("<B1-Motion>", self.motion)
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", (self.sizex, self.sizey), (0, 0, 0))
self.draw = ImageDraw.Draw(self.image)
def save(self):
filename = "temp.jpg"
self.image.save(filename)
def clear(self):
"""将画板和image清空"""
self.drawing_area.delete("all")
self.image = Image.new("RGB", (self.sizex, self.sizey), (0, 0, 0))
self.draw = ImageDraw.Draw(self.image)
def motion(self, event):
"""在画板和image上同时绘制"""
self.drawing_area.create_oval(
event.x,
event.y,
event.x + self.penWidth,
event.y + self.penWidth,
fill=self.penColor,
outline=self.penColor,
) # 在画布上画
self.draw.ellipse(
(
(event.x, event.y),
(event.x + self.penWidth, event.y + self.penWidth),
),
fill=self.penColor,
outline=self.penColor,
width=self.penWidth,
) # 在生成的图上画,point、line都太细
if __name__ == "__main__":
root = tk.Tk()
root.wm_geometry("%dx%d+%d+%d" % (300, 350, 10, 10))
root.config(bg="white")
ImageGenerator(root, 10, 10)
root.mainloop()
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