Knowra Red Red Red is a color associated with the long-wavelength end of the visible spectrum and with similar nonspectral hues. Its appearance depends on the light reaching the eye and the visual system interpreting it.
Visible spectrum : The range of electromagnetic wavelengths detectable by the human visual system. Red occupies its long-wavelength end.
Spectral color : A color sensation produced by light concentrated at a single wavelength. Spectral red is one route to red, unlike mixtures that produce similar hues.
RGB color model : An additive color model that represents colors through combinations of red, green, and blue light. Displays use its red channel to combine light into many colors.
Color symbolism : The use of colors to convey cultural, religious, political, or emotional meanings. Red's meanings are learned conventions, not properties of its wavelengths.
Wavelength : The distance between successive peaks of a wave, used to describe electromagnetic radiation. Wavelength helps distinguish spectral red light from shorter-wavelength visible light.
Color vision : The visual capacity to distinguish light by differences in its spectral composition. Red is a perceptual result of the color-vision system, not merely a wavelength.
CMYK color model : A subtractive color model using cyan, magenta, yellow, and black inks for printing. Printing generally builds reds from ink combinations rather than a red light channel.
Red flag : A red flag used as a signal of danger, warning, or political identity. Its warning sense draws on red's established visual and cultural salience.
Cone cell : A light-sensitive retinal cell that supports color vision in humans and other primates. Cone responses help the visual system produce the experience of red.
Trichromacy : Color vision based on three types of cone photoreceptors with different spectral sensitivities. Red perception depends on patterns across cone responses, not a dedicated red receptor.
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