# Repeated alpha not reaching full opacity

**URL:** <https://discourse.processing.org/t/repeated-alpha-not-reaching-full-opacity/16890>\
**Category:** Coding Questions\
**Created:** [January 6, 2020, 3:16am UTC](https://discourse.processing.org/t/repeated-alpha-not-reaching-full-opacity/16890 "2020-01-06T03:16:56Z")\
**Posts on this page:** 1\
**Showing post:** 8

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**Author:** ![Skranker](https://avatars.discourse-cdn.com/v4/letter/s/858c86/32.png) [@Skranker](https://discourse.processing.org/u/Skranker)\
**Post date:** [January 18, 2020, 12:26pm UTC](https://discourse.processing.org/t/repeated-alpha-not-reaching-full-opacity/16890/8 "2020-01-18T12:26:43Z")

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Sorry if this is a bit late, but your solution only seems to work with a white background, not with a black one.

Im trying to get is to work with my p5 sketch as in this post:  
[https://discourse.processing.org/t/trails-with-background-transparency/17139/3?u=skranker](https://discourse.processing.org/t/trails-with-background-transparency/17139/3)

Here is your solution with the **white background** that works perfectly:

 ![gifProcessingWhite](https://canada1.discourse-cdn.com/flex036/uploads/processingfoundation1/original/2X/d/d6c2a8e5b7af159de87f20861c3e4d206e8bfa6b.gif)

And here i am trying to do the same thing with a **black background** :

 ![gifProcessingBlack](https://canada1.discourse-cdn.com/flex036/uploads/processingfoundation1/original/2X/0/0f643b9f7cc10ee27e2354b181e5ae03c14d2e11.gif)

The background color turns to (205, 205, 205) for some reason and the transparency is not applied at all.

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