from skimage import data
from skimage import filters
from skimage.color import rgb2gray
import matplotlib.pyplot as plt

coffee=data.coffee()
gray_coffee=rgb2gray(coffee)

plt.figure(figsize=(15,15))

for i in range(10):
    binarized_gray=(gray_coffee>i*0.1)*1
    plt.subplot(5,2,i+1)
    plt.title("threshold:>"+str(round(i*0.1,1)))
    plt.imshow(binarized_gray,cmap='gray')

plt.tight_layout()
plt.show()