# How to do this effect: a type of "alpha" mask

**URL:** <https://forum.kirupa.com/t/how-to-do-this-effect-a-type-of-alpha-mask/191930>\
**Category:** flash\
**Created:** [June 24, 2006, 1:50am UTC](https://forum.kirupa.com/t/how-to-do-this-effect-a-type-of-alpha-mask/191930 "2006-06-24T01:50:59Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![shell2006](https://avatars.discourse-cdn.com/v4/letter/s/7993a0/32.png) [@shell2006](https://forum.kirupa.com/u/shell2006)\
**Post date:** [June 24, 2006, 1:50am UTC](https://forum.kirupa.com/t/how-to-do-this-effect-a-type-of-alpha-mask/191930/1 "2006-06-24T01:50:59Z")

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Hello,

I have to recreated this effect from a component. The component resides in a Flash 8 FLA, but it is published for Flash 6 and uses AS 1.0 OOP programming.

My goal is to re-create the transition shown in the image below. As you can see it appears to be a type of “alpha” mask, but obviously Flash 6 or 7 doesn’t support that feature.

Does anyone have any idea how this was faked?