Numpy Matrix to tkinter Canvas

Question

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)

Answer 1

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()