dHashing in Node.js

dhash.mjs

import Jimp from "jimp";

export async function getDHash(skin) {
    skin.grayscale();
    skin.resize(8, 9);

    let dHash = "";
    for (let y = 0; y < 9; y++) {
        let rowHash = 0;
        for (let x = 0; x < 8 - 1; x++) {
            const leftPixel = Jimp.intToRGBA(skin.getPixelColor(x, y)).r;
            const rightPixel = Jimp.intToRGBA(skin.getPixelColor(x + 1, y)).r;

            rowHash = (rowHash << 1) | (leftPixel > rightPixel ? 1 : 0);
        }

        dHash += rowHash.toString(16);
    }

    return dHash;
}