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file_to_png.py
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file_to_png.py
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from PIL import Image
import numpy as np
import math
import time
import sys
import os
def show_usage():
print(f"\nUsage --> {sys.argv[0]} <input_file> <output_image_name>\n")
print(f"Don't add any extension to <output_image_name>")
print(f"<output_image_name> is optional, default is \"output\"")
def get_execution_time(data_length):
return time
def hex_to_rgb(value):
length = len(value)
return tuple(int(value[i:i+length//3], 16) for i in range(0, length, length//3)) # Return a tuple with RGB values
def find_length(n):
sqrt = int(math.sqrt(n)) # Square root
for i in range(0, sqrt+1)[::-1]: # Iterate from the square root to 0
if n%i == 0: # Check if the current value is a divisor of data length
return i, int(n/i) # Return width, length
def run(input_file, output_file):
t=time.time() # Start timer
print("File "+input_file+"\n...")
with open(input_file, 'rb') as f:
hexdata = f.read().hex() # Get hex data from input_file
if len(hexdata)%6 == 0: # Data length must be a multiple of 6
pass
elif len(hexdata)%6 == 4:
print("Adding '00' at the end of hexdata") # Pad with zeros
hexdata += '00'
elif len(hexdata)%6 == 2:
print("Adding '0000' at the end of hexdata")
hexdata += '0000'
data_length = len(hexdata)
print(f"Data length = {data_length}")
print(f"Estimated execution time : {int(data_length*0.0000007)} seconds") # This value depends on your computer : data_length*(execution_time/data-length)
hex_pixels = [hexdata[i:i+6] for i in range(0, data_length, 6)] # Split hexdata every 6 characters
print("Pixels splited")
rbg_pixels = []
for hex_pixel in hex_pixels: # This step can take a long time
rbg_pixels.append(hex_to_rgb(hex_pixel)) # Convert every hex pixel value to RGB
print("Hex pixels converted to RGB")
width, length = find_length(len(rbg_pixels)) # Determine width and length of the output image so that it is as close as possible to a square.
print(f"Image length = {length}\nImage width = {width}")
matrice = []
for i in range(len(rbg_pixels)):
if i%length == 0:
array = [] # Split rbg_pixels into lines depending on length to create the matrice.
for j in range(length):
array.append(rbg_pixels[i+j])
matrice.append(array)
print("Matrice done")
array = np.array(matrice, dtype=np.uint8) # Convert matrice to numpy array
new_image = Image.fromarray(array) # Create the image with PIL
new_image.save(output_file)
print("...\nFile saved as "+output_file)
print('Execution time : '+str(time.time()-t)+" seconds")
if __name__ == '__main__':
if 1 < len(sys.argv) and len(sys.argv) < 4:
if os.path.isfile(sys.argv[1]):
if sys.argv[2]:
run(sys.argv[1], sys.argv[2]+".png")
else:
run(sys.argv[1], "output.png")
else:
print(f"File {sys.argv[1]} doesn't exist")
else:
show_usage()