Color Temperature
  • A non-luminous object (such as a piece of paper) is objectively agreed to be 'white' if it reflects all colours (visible wavelengths) approximately equally… which means it takes on the colour appearance of the ambient illumination. But unless we consciously think about it (or are photographers or colour-scientists), most people are happy to regard illumination from regular filament lightbulbs, sunlight (under varying conditions) and even fluorescent light as being 'white'!
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