# Sweeney Todd flash effect...?

**URL:** <https://forum.kirupa.com/t/sweeney-todd-flash-effect/257348>\
**Category:** flash\
**Created:** [April 13, 2008, 1:49am UTC](https://forum.kirupa.com/t/sweeney-todd-flash-effect/257348 "2008-04-13T01:49:13Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![dtrace](https://avatars.discourse-cdn.com/v4/letter/d/59ef9b/32.png) [@dtrace](https://forum.kirupa.com/u/dtrace)\
**Post date:** [April 13, 2008, 1:49am UTC](https://forum.kirupa.com/t/sweeney-todd-flash-effect/257348/1 "2008-04-13T01:49:13Z")

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If you go into the site… there is a mask effect that is used to reveal the image on the home page. It sort of bleeds outward in a very organic way.

[http://www.sweeneytoddmovie.com/](http://www.sweeneytoddmovie.com/)

The file they are using is an flv…that looks like this…

[http://sashagrey.com/burn.html](http://sashagrey.com/burn.html)

But how can you mask another image using an flv with an alpha channel? did they somehow use blending modes? or am I missing something about masking?

Thanks.