Applying a mask is a common image or video editing technique to reveal or hide parts of the image or video. We show you in this post how you can create dynamic masks to reveal and/or hide parts of an image or video.

Mashable is our go-to place for anything social media so it was a great pleasure seeing Stupeflix reviewed in a nice post by Jenn Van Grove, who describes the Stupeflix Editor as a “unique and sophisticated approach to turning digital content into story-telling entities that you can then share across the web or save for personal use.”

According to a recent AccuStream Research report, the online video value chain is forecasted to grow with a solid 25% increase in 2009 and 26% increase in 2010, to reach then a good looking $1.6 Bn. CDN and Advertising Networks are forecasted to represent more than 86% of the value chain revenue in 2009, while video CMS platforms will represent 10.5% and video indexing players 3.4%.

Ever since the Stupeflix Editor was launched, we received great feedback from our community and users, and many additional features have been suggested (eg. reverse video) and discussed. Every week Stupeflix silently introduces some of these new features into the Editor. This post puts the spotlight on our top three: