# How is this done: appears to be "alpha" mask

**URL:** <https://forum.kirupa.com/t/how-is-this-done-appears-to-be-alpha-mask/191899>\
**Category:** flash\
**Created:** [June 23, 2006, 7:11pm UTC](https://forum.kirupa.com/t/how-is-this-done-appears-to-be-alpha-mask/191899 "2006-06-23T19:11:04Z")\
**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 23, 2006, 7:11pm UTC](https://forum.kirupa.com/t/how-is-this-done-appears-to-be-alpha-mask/191899/1 "2006-06-23T19:11:04Z")

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Hello,

How is the transitions done shown in the image below. Notice that there appears to be an “alpha” mask for the images.

The orginal file is saved as Flash 8, but exported to Flash 6 AS 1.0. Perhaps, I can use Flash 8’s alpha mask and still export to Flash 6.

Thank you for reading.  
🙂