MemoryError when I normalize images by img/255

Question

I want to normalize the image data for deep learning.

I have training images. I can make a numpy array from it but if I try to img/255 in the for loop when I make that array, it raise MemoryError.

Would you tell me how to normalize the array successfully?

---Added---

code:

import numpy as np
import cv2
import os

x_data = []
for name in sorted(os.listdir('SegmentationJPEG')):
    im = cv2.imread(os.path.join('SegmentationJPEG', name))
    im = cv2.resize(im, (572, 572))
    im = cv2.cvtColor(im, cv2.COLOR_BGR2RGB)
x_data = np.asarray(x_data)

result:

MemoryError                               Traceback (most recent call last)
<ipython-input-16-2b9215277357> in <module>()
      4     im = cv2.resize(im, (572, 572))
      5     im = cv2.cvtColor(im, cv2.COLOR_BGR2RGB)
----> 6     x_data.append(im/255)
      7 x_data = np.asarray(x_data)

MemoryError: