How to scale a circular map to 255?

vision
1

I want to create a circular map similar to how we would create a gaussian map and scale the circular map to 255. how could I do the same?

2

the question is not clearly understood. Do you wanna draw like this

721×506

3

let me rephrase my question. I want to draw a circular map of radius 10 which is scaled at 255.

4

What do you mean about ‘scaled at 255’? Is pixel value of center of circle is 255 and pixel value of border is 0?

5

yes that is right pixel value of center of circle is 255 and pixel value of border is 0.

6

Maybe this sample work for you.

import numpy as np
import matplotlib.pyplot as plt


I = np.zeros((500, 500))
radius = 100
x, y = np.ogrid[-radius: radius, -radius: radius]
cy = 200
cx = 300
index = x**2 + y**2 <= radius**2
a = np.sqrt((radius - abs(y))**2 + (radius - abs(x))**2)
a = (a / a.max()) * 255
I[cy-radius:cy+radius, cx-radius:cx+radius][index] = a[index]
plt.imshow(I)
plt.show()