[SnooSux]

I work with IR sensors at work and modern smartphones pick up NIR frequencies as well. It's picked up by the red channel so combining that with the blue is probably what's making the purple color.

My guess would be that something bright enough to wash out the red channel would still leave the blue and green intact. So there should be enough information that the image is degraded but not necessarily blinded.

But I could be wrong, depending on how independently the color sensors and processing work.