Human color perception, influencing

Human color perception is only approximately constant as you probably have noticed when buying clothes in a store. If you select a set of seemingly black trousers you may very well find out at home that the selected set of trousers is actually kind of bluish. Color perception is also influenced by the colors which are present in the surround of an object. In this case, color perception could have been influenced by the lack of a sufficiently complex surround. You can find out the color of a set of trousers by putting the trousers next to another set of trousers. If you place a seemingly black set of trousers next to another one you may find out that one is actually kind of dark bluish whereas the other one is indeed black. If you take the black trousers and place them next to black velvet you will think that the trousers are kind of dark grey and that the velvet is actually black. Why color perception sometimes behaves as just described will become clearer after reading this book. 

Colorimeters also do not measure what humans see in colors of objects. Human color perception is influenced by (1) color quality of light source, (2) background color, and (3) surface texture of the sample. Colorimeter measurements, on the other hand, are performed in tighdy controlled illumination chambers and can only collect averaged spectral responses of the sampled area. It is not possible for colorimeters to express human perceived colors that are affected by various light sources or background colors. Surface texture information is also unavailable to colorimeters due to their low spatial resolution. 

Successful visual color matching requires a good understanding of the nature of color, how color is perceived, the influence of the physiological and psychological processes of color perception, the human element variability, and the ability to evaluate or assess an individual s color acuity. Next, it is important to define and... 

The human visual system extracts depth information from various physical effects which manifest as pictorial depth cues. One of these effects is atmospheric haze which has been discussed in Sect. 7.2 of chapter Human Visual Perception . Furthermore, the findings of Troscianko et al. [37] indicate that depth encoded in color (de-)saturation influences human depth perception in general. These results point towards a subconscious interpretation of relative color saturation in the viewed image. This effect is associated with the weak ordinal depth cues which support the assessment of scene layering and foreground/background separation process (see Sect. 5.2 of chapter Human Visual Perception ). 

Consumer purchases of raw chilled meat are critically influenced by color, as appearance is the first impression of meat offered to the public. Other aspects of meat quality, such as composition, palatability, and safety, are of secondary concern (Huang, Ho, and McMillin, 2005). It must be kept in mind that consumer perceptions, related to human subjectivity, will ultimately determine purchasing and consumption decisions (Verbeke et al., 2007). 

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