dither 1.3.1

A ditherer for static images with a variety of color palettes
Documentation 
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use crate::prelude::*;
#[test]
fn test_save_and_load() {
    let img = load_test_image();
    let mut output = std::env::current_dir().unwrap();

    output.push("save_load_test.png");
    img.clone().save(&output).unwrap();

    assert_eq!(img, Img::load(&output).unwrap());
    std::fs::remove_file(output).unwrap();
}

fn load_test_image() -> Img<RGB<u8>> {
    let mut input = std::env::current_dir().unwrap();
    input.push("bunny.png");

    Img::load(&input).unwrap()
}
/// No Op ditherer; doesn't do anything;

#[test]
fn test_dither_no_op() {
    const NO_OP_DITHER: Ditherer = Ditherer::new(1., &[]);

    fn no_op(p: RGB<f64>) -> (RGB<f64>, RGB<f64>) {
        (p, RGB::default())
    }
    let mut test_img_buf: Vec<RGB<f64>> = Vec::with_capacity(9);
    for y in 0..3 {
        for x in 0..3 {
            test_img_buf.push(RGB(0., f64::from(y), f64::from(x)));
        }
    }
    let img = Img::new(test_img_buf, 3).unwrap();
    assert_eq!(img, NO_OP_DITHER.dither(img.clone(), no_op));
}