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ColorLookupTable filtering causing LUT artifacts

Hey guys, In extreme lighting situations with extreme LUTs, we've found artifacts being introduced when moving from 4.7 to 4.8. The texture group for the lut is set to ColorLookupTable and when the filtering is set to DEFAULT we get wrong colors showing up in areas (pure green where it should be pure yellow. Bright red where it should be dark purple). Setting filtering to TRILINEAR fixes the issue, so it seems related to the filtering mechanism. This shows up in VR mode and mono mode: Artifact

Product Version: UE 4.8
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asked Jul 27 '15 at 02:24 AM in Rendering

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chorne
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avatar image Lovecraft_K ♦♦ STAFF Jul 27 '15 at 01:30 PM

Hi chorne -

Thank you for your report. We have assigned this issue to a member of our support staff, and they will begin investigation as soon as possible. If we are unable to reproduce the issue, or we need additional information, our staff member will comment here with additional questions. Otherwise, we will post an ‘Answer’ once we have logged the issue in our bug database or we have a solution for it.

In the meantime, please be sure to review our suggestions for how to report a bug, and feel free to edit your post if you have additional information to provide: https://answers.unrealengine.com/questions/12363/how-do-i-report-a-bug.html

Thank you -

Eric Ketchum

avatar image Logan Bailey ♦♦ STAFF Jul 27 '15 at 03:51 PM

Hello chorne,

Yes switching over to the Trilinear filter does seem to minimize the result of the color artifacting. I am not sure if this is so much of a bug or just a way to optimize the viewing of colors/ and blending inside of occulus.

I am guessing this is similar to the way to optimize the sharpness of shadows and the like.

I will look into this further

Thanks,

Logan

avatar image Logan Bailey ♦♦ STAFF Jul 29 '15 at 02:01 PM

Hello Chrome,

I haven't heard from you yet.

I was wondering if you were still experiencing this issue?

Thanks,

Logan

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1 answer: sort voted first

Hello Chrome,

At this time due to inactivity I am going to answer this question out and move the subject to rendering. If you are still experiencing this issue than please comment again and I will look into this issue further.

Thanks,

Logan

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answered Jul 30 '15 at 05:12 PM

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