python image data to numpy array code example

Example 1: display np array as image

from PIL import Image
import numpy as np

w, h = 512, 512
data = np.zeros((h, w, 3), dtype=np.uint8)
data[0:256, 0:256] = [255, 0, 0] # red patch in upper left
img = Image.fromarray(data, 'RGB')
img.save('my.png')
img.show()

Example 2: from image to numpy array

import cv2
im = cv2.imread("abc.tiff",mode='RGB')
print type(im)