How to use Python Realize picture to character drawing

This article introduces in detail “ How to use Python Realize picture to character drawing ”, Detailed content , The steps are clear , The details are handled properly , Hope this article “ How to use Python Realize picture to character drawing ” The article can help you solve your doubts , Let's follow Xiaobian's ideas and go deeper slowly , Let's learn new knowledge together .

Principle of character drawing

The principle of this character painting is also relatively simple , We can think of each character as a large pixel , A character can represent a color , The more characters , The more colors you can reflect , Character painting is more hierarchical .

Gray value and RGB

The gray value refers to the depth of the color at the point of the black-and-white image , Its scope is 0-255, White is 255, Black is 0, Other colors are somewhere in between .

RGB It's red, green and blue , Other colors can be obtained through different superposition .

To convert a picture to a character drawing , You need to define a character set first , Used for mapping with gray values , The image of each pixel RGB Value is converted to a grayscale value , Output the corresponding character to get the character drawing .

RGB To gray value , There is a transformational formula ：

gray = (2126 * r + 7152 * g + 722 * b) / 10000

Code combat

I chose a picture at random ：

My goal is to transform into the following ：

According to the above conversion principle , Let's go straight to the code ：

from PIL import Imagechar = list('M3NB6Q#OC?7>!:–;. ')def get_char(r, g, b, alpha=256):    if alpha == 0:        return ' '    grey = (2126 * r + 7152 * g + 722 * b) / 10000    char_idx = int((grey / (alpha + 1.0)) * len(char))    return char[char_idx]def write_file(out_file_name, content):    with open(out_file_name, 'w') as f:        f.write(content)def main(file_name="input.jpg", width=100, height=80, out_file_name='output.txt'):    text = ''    im = Image.open(file_name)    im = im.resize((width, height), Image.NEAREST)    for i in range(height):        for j in range(width):            text += get_char(*im.getpixel((j, i)))        text += '\n'    print(text)    write_file(out_file_name, text)if __name__ == '__main__':    main('dance.png')

The idea of procedure ：

• Defines an array of characters , The characters in this array can be written at will .

• Resolution images , Parse each pixel in the picture into RGB value .

• According to our above formula , Convert each pixel into a character in the character array .

• Concatenate the characters corresponding to all pixels , The conversion is complete .

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