There are many novel ways in which light can be polarized and through which the color of light can be changed. My favorite was to place two sheets of polarizing film on an overhead projector with the axes of polarization oriented at 90 degrees to each other. The result was that most (but not quite all) of the light would be blocked. Now adhere a strip of transparent tape (Scotch Magic Mending Tape seemed to work best) to the bottom sheet and replace the top sheet. The tape would alter the polarization and cause light to be passed through the sheets. But...it would be colored. And the color would vary, depending on the angle it was applied relative to the orientation of the film. Rotating the films with respect to each other would change both the color and intensity of the light passing through the films. Now add more tape, so that some of it layers on top of the original tape and the angle iws different from that of the first strip. More colors. Different from each other, and different still where there are two layers of tape. As tape is added and additional layers are created, more and more distinct colors appear.

Of course, this is exactly the same effect as is seen in adjustable dichroic filters, where a range of color can be created by simply rotating one part of a multilayer filter.

The point is that as light interacts with different pigments and finishes, all kinds of things can happen. Even the tint layer between the two glass laminations in side windows (and windshields, sometimes) can produce unexpected effects observable with polarized sunglasses. There is a field of stress analysis called photoelasticity that can be used to quantitatively predict loading in mechanical parts, structural members, and other parts and systems. In fact, I am encouraged to see what effects I might be able to observe with the "pearlized" paint finish on my GM vehicle, now that you have brought it up.

Thanks for showing this to us.

And then there is the programmed processing by the phone. Most cameras now have thousands of algorithms built in, so I'm sure that a smart phone has at least that number. Those algorithms are based on some weird logic that translates sorta like: "I think that *this* is what the user wanted, so I'm going to adjust this, emphasize that, etc. etc".

I've seen JPGs straight out of my decent FF camera viewed on a calibrated monitor that don't even come near what my iPhone does, SOOC.

(Maybe I'm not as good as I think I am!)