如何将画布内容转换为图像？

from Tkinter import *
root = Tk()
cv = Canvas(root)
cv.create_rectangle(10,10,50,50)
cv.pack()
root.mainloop()

我想将画布内容转换为位图或其他图像，然后执行其他操作，例如旋转或缩放图像，或更改其坐标。

位图可以提高显示我是否不再绘图的效率。

我应该怎么办？

您可以生成一个 postscript 文档（以输入到其他工具中：ImageMagick、Ghostscript 等）：

from Tkinter import *
root = Tk()
cv = Canvas(root)
cv.create_rectangle(10,10,50,50)
cv.pack()
root.mainloop()

cv.update()
cv.postscript(file="file_name.ps", colormode='color')

root.mainloop()

或者在 PILL 和 Tkinter 画布上并行绘制相同的图像（请参阅：保存 Tkinter Canvas 绘图 (Python) http://www.daniweb.com/software-development/python/code/216929/saving-a-tkinter-canvas-drawing-python）。例如（受同一篇文章启发）：

from Tkinter import *
import Image, ImageDraw

width = 400
height = 300
center = height//2
white = (255, 255, 255)
green = (0,128,0)

root = Tk()

# Tkinter create a canvas to draw on
cv = Canvas(root, width=width, height=height, bg='white')
cv.pack()

# PIL create an empty image and draw object to draw on
# memory only, not visible
image1 = Image.new("RGB", (width, height), white)
draw = ImageDraw.Draw(image1)

# do the Tkinter canvas drawings (visible)
cv.create_line([0, center, width, center], fill='green')

# do the PIL image/draw (in memory) drawings
draw.line([0, center, width, center], green)

# PIL image can be saved as .png .jpg .gif or .bmp file (among others)
filename = "my_drawing.jpg"
image1.save(filename)

root.mainloop()