Colours effect each other in unexpected ways. For example, most colours, when placed next to their complements, produce vibrating, electric effects. Other colours, in the right combination, seem quite different from what you'd expect.
In the same way that one colour can appear different in different surroundings, two similar colors may appear to be identical under some conditions. Even though the two symbols are actually slightly different tones, the contrasting backgrounds cause our brains to think that they are the same colour. This effect is harder to control, but be aware of it because it can affect your graphics in hidden ways.
Scientists have found that physiological changes take place in human beings when they are exposed to certain colours. Colours can stimulate, excite, depress, tranquilize, increase appetite and create a feeling of warmth or coolness. This is known as chromodynamics.
- (Our personal and cultural associations affect our experience of colour. Colours are seen as warm or cool mainly because of long-held (and often universal) associations. Yellow, orange and red are associated with the heat of sun and fire; blue, green and violet with the coolness of leaves, sea and the sky. Warm colours seem closer to the viewer than cool colours, but vivid cool colours can overwhelm light and subtle warm colours. Using warm colours for foreground and cool colours for background enhances the perception of depth.
Although red, yellow and orange are in general considered high-arousal colours and blue, green and most violets are low-arousal hues, the brilliance, darkness and lightness of a colour can alter the psychological message. While a light blue-green appears to be tranquil, wet and cool, a brilliant turquoise, often associated with a lush tropical ocean setting, will be more exciting to the eye. The psychological association of a colour is often more meaningful than the visual experience.
Colours act upon the body as well as the mind. Red has been shown to stimulate the senses and raise the blood pressure, while blue has the opposite effect and calms the mind).
-(www.colourmatters.com)
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