Webmaster Forum / Flash / General Flash Topics / August 2008

It looks like multi layer masking. A bit tedious to produce but reasonably
simple and does not require much of flash skills. Of course it could be well
done using just action script but I guess you wouldn't have to ask for help
with it in here if you knew how to do this :)
So let me stick to the basic first:

Basically you create movie clip with animation or animate a clip on timeline
and use it as a mask above your JPG image. In this case it's a little
square which scale into large one. Place many of these on multiple layers,
different amount on different frames. Till you fill up the entire image space.
Create Mask layers and swap the JPG so as the mask animates it start to show
another image.
I don't have the exact example but I have one that I did long ago, trying to
explain similar scenario to another member. Please go ahead and download and study
the timeline, it will be much easier than me trying to explain on in steps because
some of the things might be confusing :)

Sample of similar mask/animation/image swap:

http://flashfugitive.com/stuff/slide_05a.swf

download source

http://flashfugitive.com/stuff/slide_05a.zip