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Learn about the RGB color model, an additive color model that uses red, green and blue light to reproduce a wide range of colors. Find out how the RGB model works, how it differs from subtractive color, and how it relates to human vision and devices.
Learn about the history, variations and meanings of the color purple, from ancient dyes to modern web colors. Compare different shades of purple, such as Tyrian purple, royal purple, mauve and lavender.
Biological pigments, also known as biochromes, are substances produced by living organisms that have a color resulting from selective color absorption. Learn about the different classes of pigments, such as chlorophyll, carotenoids, anthocyanins, and melanin, and their functions and examples.
Color theory is the study of how colors behave and interact, with applications in art, science and technology. Learn about the origins, developments and controversies of color theory, from Aristotle to modern color science.
Violet is the color of light at the short wavelength end of the visible spectrum, and it is one of the seven colors that Isaac Newton labeled in 1672. Learn about the etymology, relationship to purple, and scientific properties of violet, as well as its cultural and symbolic associations.
For example, a white page under blue, pink, or purple light will reflect mostly blue, pink, or purple light to the eye, respectively; the brain, however, compensates for the effect of lighting (based on the color shift of surrounding objects) and is more likely to interpret the page as white under all three conditions, a phenomenon known as ...
Rhodopsin, also known as visual purple, is a light-sensitive receptor protein that triggers phototransduction in rods. It is a G-protein-coupled receptor that binds retinal and absorbs green-blue light, causing it to appear reddish-purple.
Color is the visual perception based on the electromagnetic spectrum, related to an object's light absorption, reflection, emission, and interference. Learn about the physical and psychological aspects of color, the color models, the color theory, and the cultural and historical variations of color names.