It’s called color constancy, and it’s why this yellow/blue dress optical illusion fools people. Our brains adjust our perception of white, based on hints in our surroundings. If you’ve ever shopped for light bulbs, you know every white light in the real world has a slight yellow or blue tint. One detail makes this especially tricky: deciding which white is “true” white. When your camera captures colors outside the triangle, we have to push and pull those invalid colors to fit inside. The following chart represents all the colors a human can see, and the triangle in the middle covers what most screens can display. We have to take those sensor readings, which measure the light from your scene, and transform them into pixel values that light up your display. Quite the opposite: your camera captures way more information than your screen can display.
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