Measuring the Color of Light - James Duncan Davidson:
If you've been using a camera for a while, you may have run into the fact that white light has a color. The light emitted by an incandescent tungsten bulb is composed of more yellows and reds than blues while the light emitted by the sun is composed of more nearly equal parts of the color spectrum. Unless you've worked with different kinds of light for a while, however, it's something that you may never have noticed to any substantial degree. Our human visual cortex is extremely good at processing out the image data it receives so that we don't normally perceive these differences much unless we train ourselves to notice them.
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