Convert RGB to black OR white

Question

How would I take an RGB image in Python and convert it to black OR white? Not grayscale, I want each pixel to be either fully black (0, 0, 0) or fully white (255, 255, 255).

Answer 1

Using opencv You can easily convert rgb to binary image

import cv2
%matplotlib inline 
import matplotlib.pyplot as plt
from skimage import io
from PIL import Image
import numpy as np

img = io.imread('http://www.bogotobogo.com/Matlab/images/MATLAB_DEMO_IMAGES/football.jpg')
img = cv2.cvtColor(img, cv2.IMREAD_COLOR)
imR=img[:,:,0] #only taking gray channel
print(img.shape)
plt.imshow(imR, cmap=plt.get_cmap('gray'))

#Gray Image
plt.imshow(imR)
plt.title('my picture')
plt.show()

#Histogram Analyze

imgg=imR
hist = cv2.calcHist([imgg],[0],None,[256],[0,256])
plt.hist(imgg.ravel(),256,[0,256])

# show the plotting graph of an image

plt.show()

#Black And White
height,width=imgg.shape
for i in range(0,height):
  for j in range(0,width):
     if(imgg[i][j]>60):
        imgg[i][j]=255
     else:
        imgg[i][j]=0

plt.imshow(imgg)