Look at a file as a picture. Each block (3 bytes) of the file will be put as RGB in one pixel. The resolution of the image is 16:9.

cast-file-to-png.py

#  cast file to png
#  Copyright (C) 2021  AdriDoesThings
#  This program is free software: you can redistribute it and/or modify
#  it under the terms of the GNU Affero General Public License as published
#  by the Free Software Foundation, either version 3 of the License, or
#  (at your option) any later version.
#  
#  This program is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU Affero General Public License for more details.
#  
#  You should have received a copy of the GNU Affero General Public License
#  along with this program.  If not, see <https://www.gnu.org/licenses/>.


from PIL import Image
from sys import argv
from os.path import getsize
from math import sqrt
import progressbar

# you need: pillow and progressbar2 - install it with: pip install pillow progressbar2


filesystem_path = argv[1]
size = getsize(filesystem_path)
filesystem = open(filesystem_path, "rb")
width = round(4 * (sqrt(size / 3)/ 3 ))
height = round(3 * (sqrt(size / 3) / 4))


im = Image.new(mode="RGB", size = (width, height))
pic = im.load()

with progressbar.ProgressBar(max_value=round(size / 3)) as bar:
    i = 0
    for y in range(height):
        for x in range(width):
            value = [x for x in filesystem.read(3)]
            while len(value) != 3:
                value.append(255)
            if value:
                pic[x,y] = tuple(value)
            else:
                pic[x,y] = (255, 255, 255)
            if i < round(size / 3):    
                i += 1
                bar.update(i)

im.save("image.png")