upscale an image in rust

To upscale an image in Rust, we'll need to use an image processing library. One popular Rust library for image processing is rust-image. With rust-image, we can use image interpolation to upscale or enlarge the image.

Here's an example Rust code snippet that uses rust-image to upscale an image by a factor of 2:

main.rs
extern crate image;

use image::GenericImage;

fn main() {
    let img = image::open("image.png").unwrap();
    let (width, height) = img.dimensions();
    let new_width = width * 2;
    let new_height = height * 2;
    let resized = img.resize(new_width, new_height, image::imageops::FilterType::Triangle);
    resized.save("upscaled_image.png").unwrap();
}
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This code opens an image file image.png, gets the dimensions of the image, calculates the new dimensions for the upscaled image, then creates a new ImageBuffer with the new dimensions and resizes the original image to the new dimensions using image interpolation with the Triangle filter. Finally, it saves the upscaled image as a new file upscaled_image.png.

You can adjust the FilterType parameter to choose a different interpolation filter. Common options in rust-image include Nearest, Triangle, Gaussian, and Lanczos3.