All human visual capabilities are, ultimately, matters of perception.  Of course, the specific nature of each input to the visual system – the visual stimuli – is important; however, similar stimuli can result in significantly different visual perceptions.  It is the interpretation of visual stimuli, occurring in the brain, that defines our visual perceptions.
     In addition to wavelength, luminance, and related measures of illumination, the brain uses other information to interpret visual inputs.  Proximity of objects to one another, color variation, brightness, contextual clues, cultural norms, and other factors can influence the perception of, and reaction to, a visual scene.
     This installment explores some of the factors that influence visual perception.  Some factors defy measurement; some are relegated to the subconscious through training, experience, or other influence on an individual’s attentional budget.  Those of which observers are aware may still defy explanation of their impact, for many are unfamiliar with the mechanisms involved.  Nonetheless, all are important contributors to interpretations of our surroundings.

     It is easy to underestimate the importance of color as a distinct component of human visual capability.  Color often plays a significant role in our recognition of objects and perceptions of spaces.
     The perception of color varies among individuals.  Defined systems of identification make it possible to compare colors and to describe them in a way that can be communicated effectively.  Coherent communication of color information is the key to color specifications (e.g. product design) and color matching (e.g. paint mixing).
     This installment of the series explores the production, “measurement,” communication, and human perception of color in our environment.  Concepts introduced in previous installments are also revisited and expanded in the context of color vision.