# Can PerlinNoise control alpha channel

**URL:** <https://forum.kirupa.com/t/can-perlinnoise-control-alpha-channel/325465>\
**Category:** flash\
**Created:** [October 17, 2011, 7:47pm UTC](https://forum.kirupa.com/t/can-perlinnoise-control-alpha-channel/325465 "2011-10-17T19:47:54Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![SplashKhat](https://avatars.discourse-cdn.com/v4/letter/s/f04885/32.png) [@SplashKhat](https://forum.kirupa.com/u/SplashKhat)\
**Post date:** [October 17, 2011, 7:47pm UTC](https://forum.kirupa.com/t/can-perlinnoise-control-alpha-channel/325465/1 "2011-10-17T19:47:54Z")

</div>

I’m trying to accomplish a similar effect as seen on :  
[URL=“[http://www.med.com.gr/24k/](http://www.med.com.gr/24k/)”][http://www.med.com.gr/24k/](http://www.med.com.gr/24k/)

I suspect its just perlin noise displacement with a loop on the DisplacementMapFilter to decrease/increase the distortion over time as well as an alpha tween. I have been able to spy that they are using caurina tweener, which isn’t of interest to me.

Its the principle I’m after, not a copy of their effect.

I’m trying to assign an alpha value to say, the White/Black area of a PerlinNoise generated Bitmap. Where the White would be 0% and the dark 100%. And have that White value increase over time so that the entire image, the filter is applied to, gradually fades into view.