What is Hue
HUE
Newton divided the visible spectrum into seven basic hues. Red, orange, yellow, green, blue, indigo, violet - ROY G BIV makes it easy to remember. Colors that can be produced by a single wavelength, the pure spectral colors, are hues. There are more hues in the visible spectrum besides just these basic seven. In the book Optiks, it tells us why Newton chose to edit it down to only seven hues. The seven are based on a belief, derived from the ancient Greek sophists, that there was a connection between the hues, the musical notes, the known objects in the solar system, and the days of the week -- so that's why those basic seven hues are the ones that get the most spin.
The graphic below shows how a few extra wavelengths can get squeezed in to various charts depicting hue. Your basic color wheel has more than seven hues too as it will show: red, red-orange, orange, yellow-orange, yellow, yellow-green, green, blue-green, blue, blue-violet, violet, and red-violet.
The Three Parts of Color
Another Variation
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