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pythonpython-imaging-libraryjpeg

Convert each pixel from a image to a letter PIL

I have a file 'map.jpg' which is composed of black and white pixels (16x16 img) and I would like to convert in a text file a white pixel to a 0 and a black pixel to a 1. I have this:

from PIL import Image
import os

mapImg = Image.open('map.png')

with open('map.txt', 'a+') as map:
    for y in range(16):
        for x in range(16):
            pix = mapImg.getpixel((x, y))
            if x == 15:
                map.write('\n')
            else:
                if pix == (255, 255, 255):
                    map.write('0')
                else:
                    map.write('1')

But I don't know why the result is this in my txt file:

000000000
0011000000
0111110000
0100000110
0010011100
0101010
0111100
000010101000
001110000
00011000000
0000100000
0011000
0000010000
00000000
000000000
000000000

which is not what the 'map.jpg' file looks like.

Edit: Thanks to Random Davis, problem solved! Just needed to change the image format because jpeg compressed the img to much or something, thanks!

Solution

  • If your image is a jpg, then it's lossily compressed, meaning that all the pixels won't necessarily be fully black or white. You need a lossless source that truly has only those two colors, otherwise pixels will be miscategorized.