extract.js

/**
 * Example for using LWIP to extract parts of an image.
 */

const lwip = require('../');

lwip.open('lena.jpg', (err, image) => {
    if (err) return console.log(err);

    image.extract(230, 230, 370, 300, (err, eyes) => {
        eyes.writeFile('lena_eyes.jpg', err => {
            if (err) return console.log('eyes:', err);
            console.log('eyes: done');
        });

        eyes.extract(0, 0, 70, 71, (err, left_eye) => {
            left_eye.writeFile('lena_eyes_left.jpg', err => {
                if (err) return console.log('eyes left:', err);
                console.log('eyes left: done');
            });
        });

        eyes.extract(71, 0, 141, 71, (err, right_eye) => {
            right_eye.writeFile('lena_eyes_right.jpg', err => {
                if (err) return console.log('eyes right:', err);
                console.log('eyes right: done');
            });
        });
    });

    image.extract(240, 320, 350, 380, (err, eyes) => {
        eyes.writeFile('lena_mouth.jpg', err => {
            if (err) return console.log('mouth:', err);
            console.log('mouth: done');
        });
    });

});