imagething.py

import numpy as np
from scipy.misc import imsave

max_y = 0
max_x = 0

with open('Stego_3.txt') as f:
    contents = f.readlines()

coordinates = []
for line in contents:
    coords, color = line.split(':')
    y, x = coords.split(',')
    max_y = max(int(y), max_y)
    max_x = max(int(x), max_x)


image = np.ndarray([max_x+1, max_y+1, 3])
for line in contents:
    coords, color = line.split(':')
    x, y = coords.split(',')
    y = int(y)
    x = int(x)

    color = color.split()[0]
    color = color[1:-1]
    r, g, b = [int(x) for x in color.split(',')]
    
    image[y, x, 0] = r
    image[y, x, 1] = g
    image[y, x, 2] = b

imsave('test.png', image)