如何在Rust中保存子图像？

[dependencies]
image = "0.23"

use image::{DynamicImage, GenericImageView, ImageBuffer, Rgba};

let image_path = "path/to/image.png";
let image = image::open(image_path).expect("Failed to open image");

let x = 100; // 子图像左上角的x坐标
let y = 100; // 子图像左上角的y坐标
let width = 200; // 子图像的宽度
let height = 200; // 子图像的高度

let sub_image = image.crop(x, y, width, height);

let mut sub_image_buffer = ImageBuffer::<Rgba<u8>, Vec<u8>>::new(width, height);
sub_image_buffer.copy_from(&sub_image, 0, 0).expect("Failed to copy sub image");

let sub_image_path = "path/to/sub_image.png";
sub_image_buffer.save(sub_image_path).expect("Failed to save sub image");