The Visual Observing Situation

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There are three components necessary for the perception of color:

• Light, which supplies the spectral energy required for viewing color. We cannot see color in the dark.
• An Object, which modifies the spectral energy from the light source. The different colors affect the light in different ways. For instance, red objects modify the light differently than green objects.
• An Observer, whose eye and mind perceive color and appearance.

Color may be evaluated subjectively (visually) or it may be evaluated objectively, as with a spectrophotometer or colorimeter. In order for color to be quantified objectively, all three components of the visual observing situation must be taken into account.

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