from PIL import Image
import matplotlib.pyplot as plt
import requests
from io import BytesIO

url = '.../The_Earth_seen_from_Apollo_17.jpg'
response = requests.get(url)
img = Image.open(BytesIO(response.content))

plt.figure(figsize=(8, 8))
plt.imshow(img)
plt.axis('off')
plt.show()

# 크기와 모드
print(img.size)     # (1024, 1024)
print(img.mode)     # RGB

# 한 픽셀의 RGB 값
x = img.size[0] // 2
y = img.size[1] // 2
pixel = img.getpixel((x, y))

print('R', pixel[0])
print('G', pixel[1])
print('B', pixel[2])

import numpy as np

arr = np.array(img)
print(arr.shape)   # (H, W, 3)

R = arr[:, :, 0]
G = arr[:, :, 1]
B = arr[:, :, 2]

fig, ax = plt.subplots(1, 3, figsize=(15, 5))
ax[0].imshow(R, cmap='Reds')
ax[1].imshow(G, cmap='Greens')
ax[2].imshow(B, cmap='Blues')
plt.show()