How to retrieve just the thumbnail and the origin size of an image from a url that contains an image ?
<p>i want to make a tool to load all images from a website  running on my IOS device.
but i would like to filter out the images which are small from those.</p>

<p>So, I have to get the size of the image , 
How to retrieve just the thumbnail and the origin size of an image from a url that contains an image ? 
 make sure not do this after loading the entire images, get these data directly requesting the url .)</p>

<p>any feedback or answer will be appreciated ~.</p>
