WEBVTT

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Color can be described as having three dimensions: Hue, Saturation, and Brightness.

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Hue refers to the color quality and is best described by the names we give colors, like "red" and "green".

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Saturation is the purity of the color.

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A stimulus of a single wavelength is the purest color;

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adding more wavelengths, like adding white to a color, makes the color less saturated.

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Brightness is how intense or dim we experience the color.

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Trichromatic theory explains color vision by our having three classes of cones

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each sensitive to different wavelengths: short, middle and long.

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Trichromatic theory helps us explain what we call color blindness.

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Most people that we call color blind are not color blind but are missing one of the three cone classes.

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Opponent-process theory explains color as the result of different processes

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where pairs of colors tend to cancel each other out: red-green, and blue-yellow.

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Opponent–process theory helps us understand the color afterimages we see -

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for example, seeing a blue afterimage after staring at a yellow patch.