People are constantly exposed to different types of light and are surrounded by many hues which is perceived as something ordinary. The question is, whether or not different types of light have any impact on human perception of colour and whether light can affect colour to such an extent that it changes our perception and description. It is a known fact that every colour has several symbolic meanings. The aim of the diploma thesis is to study whether light affects the changed symbolic significance of blue, how blue hues change under the light and how observers perceive this. 12 samples of blue were chosen, each differing in its tone, saturation and lightness. The candidates observed them in the colour viewing light booth under the standard lightlight illuminant A, standard daylight illuminant D65 and cool fluorescent illuminant F2. All samples were then measured with spectrophotometer. In the analysis part of the thesis the results of the testing and the results of the measuring were combined in the complete analysis of blue hues under each illuminant. The results show that the cold illuminant makes the colour colder, while the warm one makes it warmer. The change of the illuminant causes the difference in colour and its parameters: hue, saturation and lightness. A change in the colour, resulting from changed illumination, also results in the change of the emotional response of the observer and the symbolic meaning of the colour. The findings show that the basic colour parameters do not affect whether or how the response of the observers will change when the illumination changes.
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