hcie-rust-v3.05/hcie-io/examples/inspect_diff.rs

fn main() {
    let ref_img = image::open("_images/_psd_stil_test/test_2/Emboss.png")
        .unwrap()
        .to_rgba8();
    let test_img = image::open("/tmp/test2_Emboss.png").unwrap().to_rgba8();

    let mut diff_sum = 0.0;
    let mut max_diff = 0;
    let mut px = 0;

    let mut printed = 0;

    for y in 0..ref_img.height() {
        for x in 0..ref_img.width() {
            let rp = ref_img.get_pixel(x, y);
            let tp = test_img.get_pixel(x, y);

            let d = (rp[0] as i32 - tp[0] as i32).abs()
                + (rp[1] as i32 - tp[1] as i32).abs()
                + (rp[2] as i32 - tp[2] as i32).abs()
                + (rp[3] as i32 - tp[3] as i32).abs();

            diff_sum += d as f64;
            max_diff = max_diff.max(d);
            px += 4;

            if d > 100 && printed < 20 {
                println!("x: {}, y: {} | REF: {:?} | TEST: {:?}", x, y, rp, tp);
                printed += 1;
            }
        }
    }

    println!("Avg diff per channel: {:.2}", diff_sum / px as f64);
    println!("Max pixel diff: {}", max_diff);
}