Some of the iPhone X have a problem with the OLED Display after upgrade to iOS 12
Among the bugs of iOS 12 apparently there is also a calibration incorrect color that is very clear on the OLED of the iPhone X.
Some users on Reddit are reporting this issue. Basically the colours are faded, the blacks are not as deep and there is usually a lowest contrast.
The feeling immersive, especially with the True Tone active, which are able to give these expensive OLED panels is fantastic, but after the upgrade to iOS 12 some users report color much less intense.
A similar thing had happened in the past, then Apple with a software update has recalibrated things and resolve them immediately. So this is not a hardware problem, but something that is easily solved. All this, together with the medals of the application Activities that have disappeared, will be resolved in the near future. We will keep you updated.
The article Some of the iPhone X have a problem with the OLED Display after upgrade to iOS 12 comes from iSpazio.