Convert an image to simple ASCII-art

ascii_image.rs

extern crate image;

use std::io::File;
use image::GenericImage;

fn main() {
    let path = Path::new("examples/test_image.png");
    let file = File::open(&path);

    match image::load(file, image::ImageFormat::PNG) {
        Ok(raw_image) => {
            let image = raw_image.resize(180, 180, image::FilterType::Nearest).grayscale();
            let (w, h) = image.dimensions();

            for j in range(0, h) {
                for i in range(0, w) {
                    let (red, _, _, _) = image.get_pixel(i, j).channels();

                    print!("{}", ascii_color(red));
                }
                println!("")
            }
        },
        Err(e) => println!("Error! {}", e),
    }
}

fn ascii_color(value: u8) -> char {
    match value / 64 {
        0 => '.',
        1 => '-',
        2 => '/',
        3 => '#',
        _ => ' ',
    }
}