frequency : Java Glossary
Pure colours are the colours of the rainbow. Higher frequency light in the rainbow
spectrum of visible light has shorter wavelengths and more energy. Mixed colours like
purple and brown don’t appear on the rainbow. They can are created by mixing
pure colours. Because of the way human vision works, it is possible to simulate the
pure colours with mixtures of red, green and blue light. The Wavelength package will let you create the
pure rainbow colours (java.awt.Color objects) given their wavelength in nanometers or
their frequency in teraHertz.