What’s the reason that some things, such as gemstones, may appear a different color to a camera than an eye?

Question

What’s the reason that some things, such as gemstones, may appear a different color to a camera than an eye?

In: Physics

Answer 1

Your eye catches a signal, which is then encoded and sent to your brain, which interprets it. This interpretation may not be identical between brains, or between your brain and a device like a camera. (Where, of course, you still have to use your eye and brain to see.)

The signal is the same, but the algorithm that turns it into something legible like a picture – in your brain or in the camera – is not the same one.