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Billboard texture rendering gamma - mobile

When using a billboard component to display a texture in 2d, I noticed that when running on android, or using mobile preview ES2, the texture displayed is considerably darker than it should be.

(Correct colour on the left, darkened colour while using mobile preview on right) Correct colours when playing in editor Incorrect colours in mobile preview/android

Enabling mobile HDR corrects it, but comes at a large performance cost. Using material billboard components also can correct it, but again there is a noticeable performance cost in doing so. The issue only seems to happen with billboard components.

Disabling sRGB on the texture causes it to appear correctly on Android and mobile preview ES2, however it then appears extremely washed out when playing in editor. It will also display this same washed out version when used in UMG while playing in editor and iOS. On android, disabling sRGB makes it display correctly at all times.

alt text

It seems like the gamma correction is causing it to display incorrectly?

I have made a simple project to show the problem, just play using mobile preview to see the issue https://drive.google.com/open?id=1QgCZncD7MBZ56wybD_5VRgul3AmY2k6a

Product Version: UE 4.19
mobile.png (8.3 kB)
normal.png (12.6 kB)
non-srgb.png (16.2 kB)
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asked Jun 05 '18 at 03:06 AM in Bug Reports

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avatar image Jeff A ♦♦ STAFF Jun 06 '18 at 01:53 PM


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