Hue is the perception of how similar a stimulus is to red, green, blue etc. Luminous efficiency, or luminosity, measures the effect that light of different wavelengths has on the human visual system.
This is accomplished by adding hue and chromatic (saturation) perception to luminance (light-to-dark) perception.
These measures are analogous to the human perceptions of hue, brightness and chroma respectively and we refer to them as such for simplicity.
The focus is on quantitative measurements of human perception of lightness, hue and chroma (or colorfulness) of natural and artificial targets determined by an advanced color matching instrument and training protocol that made it possible to use naïve observers.
Even your own perception of a hue, tone, or texture is bound to vary depending on your mood or the context of the situation.
That is, the RAM produces a correlate of the perception of a yellower hue at higher photostimulus intensities.
We can reinforce the point by referring to the fact that it is common to find color authorities explain a central aspect of color, the property of having a hue, as follows: "Hue: attribute of colour perception denoted by the terms yellow, red, blue, green and so forth" (Kuehni 2005, p. 187; see also Byrne and Hilbert 1997b, p. 447).
In [21], the authors propose a no-reference quality metric also based on the contrast, but taking into account the human perception, and in [22], the hue feature is exploited.
This analysis revealed that, despite a qualitative match to human visual perception of wild birds and hue values within the natural range of variation, our manipulated males fell outside this range when coloration was quantified using the avian visual model (additional file 1).
Consider basic "color theory" and how warm hues — reds, oranges, yellows — play tricks on perception.
