如何在Rust中将图片转换为纯黑白

[dependencies]
image = "0.23.14"

use image::{DynamicImage, GenericImageView};

fn load_image(path: &str) -> DynamicImage {
    image::open(path).expect("Failed to load image")
}

fn convert_to_grayscale(image: DynamicImage) -> DynamicImage {
    image.to_luma()
}

fn save_image(image: DynamicImage, path: &str) {
    image.save(path).expect("Failed to save image");
}

use image::{DynamicImage, GenericImageView};

fn load_image(path: &str) -> DynamicImage {
    image::open(path).expect("Failed to load image")
}

fn convert_to_grayscale(image: DynamicImage) -> DynamicImage {
    image.to_luma()
}

fn save_image(image: DynamicImage, path: &str) {
    image.save(path).expect("Failed to save image");
}

fn main() {
    let input_path = "input.jpg";
    let output_path = "output.jpg";

    let image = load_image(input_path);
    let grayscale_image = convert_to_grayscale(image);
    save_image(grayscale_image, output_path);
}