# Dirty and Blurry lightmap on iPad/iPhone with 4.19.2 (UE-52794)

**URL:** <https://forums.unrealengine.com/t/dirty-and-blurry-lightmap-on-ipad-iphone-with-4-19-2-ue-52794/425248>\
**Category:** Platform & Builds\
**Tags:** ipad, UE4-19, unreal-engine, iOS, iphone, Lightmap, question\
**Created:** [May 16, 2018, 2:34pm UTC](https://forums.unrealengine.com/t/dirty-and-blurry-lightmap-on-ipad-iphone-with-4-19-2-ue-52794/425248 "2018-05-16T14:34:30Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Maxxi](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Maxxi](https://forums.unrealengine.com/u/Maxxi)\
**Post date:** [May 16, 2018, 2:34pm UTC](https://forums.unrealengine.com/t/dirty-and-blurry-lightmap-on-ipad-iphone-with-4-19-2-ue-52794/425248/1 "2018-05-16T14:34:30Z")

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Hi,

Apple forces developers now to use full screen on iPhone X which is only available on UE4 4.19.

So we convert our project from 4.17 to 4.19 without changing anything and package it.

The lightmaps are dirty in 4.19 even using PVRTC=4 (uncompress lightmaps)

The lightmaps are perfectly fine in 4.17 with only PVRTC=1 (uncompress lightmaps)

This bug is also in 4.18 (UE-52794).

It seems also the colors are whiter in 4.19.

Any workaround?

 ![241226-ue4-419-01.jpg](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/2/0/22008e2cc0eb1420028506536458d69053ea6d4c.jpeg)

 ![241227-ue4-417-01.jpg](https://d3kjluh73b9h9o.cloudfront.net/original/4X/7/a/0/7a0fa9849cde4ce0755a59141e931c808b8b454a.jpeg)

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**Author:** ![erodann](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@erodann](https://forums.unrealengine.com/u/erodann)\
**Post date:** [May 17, 2018, 1:39pm UTC](https://forums.unrealengine.com/t/dirty-and-blurry-lightmap-on-ipad-iphone-with-4-19-2-ue-52794/425248/2 "2018-05-17T13:39:48Z")

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Same problem indeed with the ue4 4.18 …  
Any solution ?

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<div class="post-metadata">

**Author:** ![Maxxi](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Maxxi](https://forums.unrealengine.com/u/Maxxi)\
**Post date:** [May 18, 2018, 10:45am UTC](https://forums.unrealengine.com/t/dirty-and-blurry-lightmap-on-ipad-iphone-with-4-19-2-ue-52794/425248/3 "2018-05-18T10:45:53Z")

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I found a workaround, ASTC is working so the bug is clearly coming form PVRTC.

But the colors are still not the same as it is in 4.17 or in the editor in 4.19.2!