You can tell what is 'yellow' in black and white
No, you can't. Yellow doesn't exist in a black and white image, so how could you possibly tell what is yellow? The only "color" that a B&W TV generates is white, and the illusion of black and shades of gray are created by varying the intensity of the white. White at half intensity appears medium gray, and when the white is simply off, it appears black. This is known as luminance, AKA: "luma". B&W TVs only have white phosphor, so white light is the only thing they can generate, and B&W video signals only contain luminance values.
If you see two cars on a B&W TV, one of which is light blue in reality, with the other being yellow in reality, and they have the same luminance value, they will both appear to be an identical shade of gray on your TV. The only thing you can tell with regard to colors on a B&W TV is, in some cases, what color something is
not. For example, a car that appears dark gray can't possibly be yellow or any other light shade of color in reality.
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