When Black and White Are Gray

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So how do you know if you are looking at a gray object in average light, or a white one in dim light, or even a black one in very bright light? Generally this dilemma isn't a very challenging one since we can see that object in context and our brains automatically help us figure such things out. But what about your camera?....

More... (http://www.earthboundlight.com/phototips/black-and-white-are-gray.html)