Sorry to hear that, I don't have the pleasure to know what happens to those originally unaffected but seems like everyone is now on the purple boat. TBF, I am having a 1/8 chance of having a pure black picture if the camera decides to do so with a lower ISO. But the darker the scene, the likelier it will resort to high ISO and that is confirmed to be purple.
With a moderately super dark scene (No idea how to quantify), such as under a few blankets or in a drawer that leaks light etc, I have from time to time drawn a pure black picture.
As usual in real life you will hardly have a pure black scene anyway and I feel that it should be the case of the very dark and maybe there are cases where you will have good luck with ISO2500, 1500, etc that begets you a better chance of no purple.
Anyway its a shoddy job, I have gotten over my grief with Apple, I am really tempted to trade in for a 17 Pro and testing every unit while at the store and just ripping through unit after unit to get a pure black one or if not I will just return everything to the store without a purchase! That will be my revenge.
