Image natural size

natural-image-size.js

/**
* Solution for unsupported browsers (create dummy image to get real dimensions):
*/

function realImgDimension(img) {
    var i = new Image();
    i.src = img.src;
    return {
        naturalWidth: i.width, 
        naturalHeight: i.height
    };
}
  
var myImage = document.getElementById('myImage');

myImage.addEventListener('load', function() {
    var realSize = realImgDimension(this);
    console.log('My width is: ', realSize.naturalWidth);
    console.log('My height is: ', realSize.naturalHeight);
});