extract.js

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

var path = require('path'),
    lwip = require('../');

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

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

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

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

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

});