CODEWITHSUNDEEP
pythonnumpycanvastkintertkinter-canvas
Basj
Basj

Reputation: 46381

Numpy Matrix to tkinter Canvas

How to display a Numpy matrix, as a bitmap, into a Tkinter canvas? More precisely, how to fill a PhotoImage with content from a matrix?

photo = ImageTk.PhotoImage(...)
self.canvas.create_image(0,0,image=photo,anchor=Tkinter.NW)

Upvotes: 2

Views: 7748

Answers (1)

Basj
Basj

Reputation: 46381

Here is working solution, slightly modified to make it work (some function was deprecated) and to simplify it to keep only the necessary part. We have to use Image.frombytes(...) to read the data in the numpy matrix.

import Tkinter
from PIL import Image, ImageTk
import numpy

class mainWindow():
    def __init__(self):
        self.root = Tkinter.Tk()
        self.frame = Tkinter.Frame(self.root, width=500, height=400)
        self.frame.pack()
        self.canvas = Tkinter.Canvas(self.frame, width=500,height=400)
        self.canvas.place(x=-2,y=-2)
        data=numpy.array(numpy.random.random((400,500))*100,dtype=int)
        self.im=Image.frombytes('L', (data.shape[1],data.shape[0]), data.astype('b').tostring())
        self.photo = ImageTk.PhotoImage(image=self.im)
        self.canvas.create_image(0,0,image=self.photo,anchor=Tkinter.NW)
        self.root.update()
        self.root.mainloop()

mainWindow()

Upvotes: 2

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