added jQuery.calcNaturalWH / jQuery.fn.calcNaturalWH() to jQuery.loadImg.
This utilily function waits img loading and returns naturalWidth, naturalHeight. Also do polyfill things for non-naturalWidth/Height supported browsers.

$.calcNaturalWH('img1.jpg').done(function(wh){
    alert(wh.width); // 1200
    alert(wh.height); // 1000
})

$('img#anImgElementOnThePage').calcNaturalWH().done(function(wh){
    alert(wh.width); // 1200
    alert(wh.height); // 1000
});

• Takazudo/jQuery.loadImg - GitHub