Convert any image to 784(28*28) grayscale pixel dataframe.

images2dataframe.py

import pandas as pd
import numpy as np
import cv2
image_files = pd.DataFrame(columns=range(784)).add_prefix('pixels_')
for i in range(1, 6):
    r_image = cv2.imread(f'images/{i}.JPG')
    numpy_image = cv2.cvtColor(r_image, cv2.COLOR_BGR2GRAY)
    image = cv2.resize(numpy_image, (28, 28)).astype(np.float32)
    image = image.reshape(-1)
    image_files.loc[f'image_{i}', 'pixels_0':] = image
print(image_files.head())

nice!