I wrote a script that manipulates a picture without photoshop, it's open sourced

[juji]

var Jimp = require("jimp");

var fileName = 'handshake.jpg';
var imageCaption = "Proud to be Cody's friend";
var loadedImage;

Jimp.read(fileName)
    .then(function (image) {
        loadedImage = image;
        return Jimp.loadFont(Jimp.FONT_SANS_64_BLACK);
    })
    .then(function (font) {
        loadedImage.print(font, 130, 72, imageCaption)
                   .write(fileName);
    })
    .catch(function (err) {
        console.error(err);
    });