new_w = 100
w, h = img.size
img = img.convert("L").resize((new_w, int(new_w*h//w)))
w, h = img.size
data = img.load()
img

from PIL import ImageFont, ImageDraw

f_size = 3
img_new = Image.new('L', (w * f_size, h * f_size), 255)
f = ImageFont.truetype('arial.ttf', f_size)
d = ImageDraw.Draw(img_new)
n = len(ascii_chars)-1
for y in range(h):
    for x in range(w):
        char = ascii_chars[data[x, y]*n//255]
        d.text((x * f_size, y * f_size), char, fill=0, font=f)
img_new

from PIL import Image, ImageFont, ImageDraw
def img2charImg(filename, new_wight, font_size):
    "小小明：https://blog.csdn.net/as604049322"
    ascii_chars = "MNHQ$OC67+>!:-. "
    img = Image.open(filename)
    w, h = img.size
    img = img.convert("L").resize((new_wight, int(new_wight*h//w)))
    w, h = img.size
    data = img.load()
    img_new = Image.new('L', (w * font_size, h * font_size), 255)
    f = ImageFont.truetype('arial.ttf', font_size)
    d = ImageDraw.Draw(img_new)
    n = len(ascii_chars)-1
    for y in range(h):
        for x in range(w):
            char = ascii_chars[data[x, y]*n//255]
            d.text((x * font_size, y * font_size), char, fill=0, font=f)
    return img_new

img2charImg("love.jpg", 200, 2)

from PIL import Image

def img2charTxt(filename, new_wight, txtname):
    "小小明：https://blog.csdn.net/as604049322"
    ascii_chars = "MNHQ$OC67+>!:-. "
    img = Image.open(filename)
    img = img.convert("L")
    w, h = img.size
    img = img.resize((new_wight*2, int(new_wight*h//w)))
    w, h = img.size
    data = img.load()
    result = []
    n = len(ascii_chars)-1
    for y in range(h):
        line = "".join(ascii_chars[data[x, y]*n//255] for x in range(w))
        line += "\n"
        result.append(line)
    with open(txtname, "w") as f:
        f.writelines(result)

img2charTxt("test.jpg", 100, "image.txt")