Convert Image to ASCII Art in Python

from PIL import Image
import sys

ASCII_CHARS = "@%#*+=-:. "

def resize_image(image, new_width=100):
    """Resize image maintaining aspect ratio."""
    width, height = image.size
    ratio = height / width
    new_height = int(new_width * ratio * 0.55)  # 0.55 adjusts for font aspect ratio
    return image.resize((new_width, new_height))

def grayify(image):
    """Convert image to grayscale."""
    return image.convert("L")

def pixels_to_ascii(image):
    """Convert grayscale pixels to ASCII characters."""
    pixels = image.getdata()
    return "".join(ASCII_CHARS[pixel // 25] for pixel in pixels)

def main(image_path, width=100):
    try:
        image = Image.open(image_path)
    except Exception as e:
        print(f"Unable to open image: {e}")
        sys.exit(1)

    image = resize_image(grayify(image), width)
    ascii_str = pixels_to_ascii(image)

    # Format into lines
    pixel_count = len(ascii_str)
    ascii_art = "\n".join(ascii_str[i:(i + width)] for i in range(0, pixel_count, width))

    print(ascii_art)

if __name__ == "__main__":
    if len(sys.argv) > 1:
        main(sys.argv[1])
    else:
        print("Usage: python script.py <image_path> [width]")