Apple Deliberately Blocks iPhone X’s Portrait Lighting Effects on Older iPhones
The new Portrait Lighting effects available on the iPhone 8 and the iPhone X could run on previous iPhone models as well, but Apple has implemented a restriction that blocks previous-generation devices from enabling it.
This is what developer Steven Troughton-Smith has discovered after running a few tests, explaining that it all seems to be just a software limitation that Apple introduced to keep Portrait Lighting an exclusive feature of the latest iPhone models.
As part of his test, Troughton-Smith transferred a photo taken with the iPhone 7 Plus Portrait mode to his Mac to make a series of metadata changes, only to then upload the tweaked photo to his iPhone X.
Software limitation needed because of older hardware