# How did they do it

**URL:** <https://forum.kirupa.com/t/how-did-they-do-it/188091>\
**Category:** Uncategorized\
**Created:** [May 4, 2006, 2:02pm UTC](https://forum.kirupa.com/t/how-did-they-do-it/188091 "2006-05-04T14:02:04Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![tekoer](https://avatars.discourse-cdn.com/v4/letter/t/ecccb3/32.png) [@tekoer](https://forum.kirupa.com/u/tekoer)\
**Post date:** [May 4, 2006, 2:02pm UTC](https://forum.kirupa.com/t/how-did-they-do-it/188091/1 "2006-05-04T14:02:04Z")

</div>

[www.sky.com/hd](http://www.sky.com/hd)  
Just wondering how they did the masking effect when you drag and see the hd/standard image. You’ll find it if you go to “more detail” and " see the difference"  
Could anybody make an example? That would be great!