Adding a white circle to an image

Question

im using python 3.7.4, im trying to add to an image a white circle, but im inable to add the color white. this is my code so far:(i already made a certain image)

from PIL import Image
import matplotlib.pyplot as plt
import matplotlib.image as mpimg
def ima(n,m):
    what=Image.new(mode='L', size=(n,n), color=m)
    mat=what.load()
    for x in range(n):
        for y in range(n):
            mat[x,y]=x%256
    return what
image=surprise(200,255) #my random image
from PIL import Image, ImageDraw
image=ima(200,255)
draw=ImageDraw.Draw(image)
draw.ellipse([(50,50),(190,245)],fill='white',outline='white') #i want the fill to be white,i tried writing None, it did not give me a white circle.(a circle of a differnet color)
plt.show(block=image)
imageplot=plt.imshow(image)

Answer 1

This version works:

#!/usr/bin/env python3
from PIL import Image, ImageDraw
import matplotlib.pyplot as plt

def ima(n,m):
    """Create and return an nxn gradient image"""
    what=Image.new(mode='L', size=(n,n), color=m)
    mat=what.load()
    for x in range(n):
        for y in range(n):
            mat[x,y]=x%256
    return what

# Create image 200x200
image=ima(200,255)

# Get drawing handle
draw=ImageDraw.Draw(image)
draw.ellipse([(50,50),(190,245)],fill='white',outline='white')

# Display result
image.show()