How to use Python to convert pictures into character paintings

First of all, there is a problem, which is to simulate grayscale. Here is a formula:

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Gray = 0.2126 × R + 0.7152 × G + 0.0722 × B

This will be easier to handle. Of course, in RGB mode, although the color range of 256x256x256 is converted into a grayscale range of 256, the characters are still not in one-to-one correspondence. We can solve this problem by using one character to correspond to multiple grayscales.

Remember to install the PIL library first, including:

If it is Python 2, run pip install PIL.

If it is Python 3, run pip install pillow.

Let’s go directly to the code:

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from PIL import Image
#设置显示的字符集
ascii_char = list("$@B%8&WM#*oahkbdpqwmZO0QLCJUYXzcvunxrjft/\|()1{}[]?-_+~<>i!lI;:,\"^`'. ")    
WIDTH = 130
HEIGHT = 50
def get_char(r,g,b,alpha = 256):
    if alpha == 0:
        return ' '
    length = len(ascii_char)
    gray = int(0.2126 * r + 0.7152 * g + 0.0722 * b)
    unit = (255.0 + 1)/length
    return ascii_char[int(gray/unit)]
if __name__ == '__main__':
    img = "E:/WindowsDocuments/G7/Desktop/1.png"
    im = Image.open(img)
    im = im.resize((WIDTH,HEIGHT), Image.NEAREST)
    txt = ""
    for i in range(HEIGHT):
        for j in range(WIDTH):
            txt += get_char(*im.getpixel((j,i)))
        txt += '\n'
    print(txt)

If you want to output to a file, you can add the file name you want to save in the definition part OUTPUT = 'output.txt', and then write it at the end:

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with open(OUTPUT, 'w') as f:
    f.write(txt)

Finally, we got this:

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