Rood attributed to the terms ; Purity(Saturation), Lightness(Value), and Hue, which he discussed in depth in his book, "Modern Chromatics".Hue which is how you describe color: red,green,blue,yellow. Things that are not hues are browns, and pinks which are just variations of orange and red. Saturation is simply means how 'pure" is the color, without concerning light, how intense the color is. Lightness has to do with value of a color, and how light or dark a color is in terms of the amount of light reflected or absorbed.
Rood also did much research and brought to light the ideas of Additive color mixing. Additive color is defined as the way our eye construes wavelengths of light, which therefore changes are preception of color. It is based on the color of light that is reflected off of a surface into our eye. He clamied in "Modern Chromatics" that any two colors that mixed and relfected white light were complimentary. Therefore he encouraged painters to "paint with light!".
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