Due to the location of R and G primaries near the 'almost flat' spectral segment, RGB color space is reasonably good with approximating spectral orange, yellow, and bright (yellowish) green, but is especially poor in reproducing the visual appearance of spectral colors in the vicinity of central green, and between green and blue, as well as extreme spectral colors approaching IR or UV. Due to different chromaticity properties of different spectral segments, and also due to practical limitations of light sources, the actual distance between RGB pure color wheel colors and spectral colors shows a complicated dependence on the hue. In reality, the spectral bandwidth of most primaries means that most color spaces are entirely non-spectral. In this case, all other colors are inherently non-spectral. For example, the spectral locus of the CIEXYZ chromaticity diagram contains all the spectral colors (to the eye of the standard observer).Ī trichromatic color space is defined by three primary colors, which can theoretically be spectral colors. When excluding luminance and considering a two-dimensional color space ( chromaticity diagram), the spectral colors form a curve known as the spectral locus. When considering a three- dimensional color space (which includes luminance), the spectral colors form a surface. In color spaces which include all, or most spectral colors, they form a part of boundary of the set of all real colors. White is in the central part of the interior of the diagram, since when all colors of light are mixed together, they produce white. All other colors are not spectral: the bottom line is the line of purples, whilst within the interior of the diagram are unsaturated colors that are various mixtures of a spectral color or a purple color with white, a grayscale color. Likewise, light comprising several wavelengths cannot evoke a spectral color.ĬIE xy chromaticity diagram The spectrum colors are the colors on the horseshoe-shaped curve on the outside of the diagram. Extra-spectral colors cannot be evoked with a single wavelength of light, but rather by a combination of wavelengths. Every wavelength of visible light is perceived as a spectral color when viewed as a continuous spectrum, these colors are seen as the familiar rainbow.Īll colors that do not qualify as a spectral color are called non-spectral colors or extra-spectral colors. ![]() either a single wavelength of light in the visible spectrum, or a relatively narrow band of wavelengths (e.g. Laser beams are monochromatic light, thereby exhibiting spectral colors.Ī spectral color is a color that is evoked by monochromatic light, i.e. ![]() JSTOR ( December 2009) ( Learn how and when to remove this template message)Ī rainbow is a decomposition of white light into all of the spectral colors. ![]() Unsourced material may be challenged and removed. Please help improve this article by adding citations to reliable sources. This article needs additional citations for verification.
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