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HCL (Hue-Chroma-Luminance) or LCh refers to any of the many cylindrical color space models that are designed to accord with human perception of color with the three parameters. Lch has been adopted by information visualization practitioners to present data without the bias implicit in using varying saturation.[1][2][3] They are, in general, designed to have characteristics of both cylindrical translations of the RGB color space, such as HSL and HSV, and the L*a*b* color space. Some conflicting definitions of the terms are:
A name for a cylindrical transformation of CIELuv (CIELChuv) employed by Ihaka (2003)[1] and adopted by Zeileis et al. (2009, 2020).[2][4] This name appears to be the one most commonly used in information visualization. Ihaka, Zeileis, and co-authors also provide software implementations and web pages to promote its use.[4]
A name for cylindrical CIELab (CIELChab), employed by chroma.js.
"HCL" designed in 2005 by Sarifuddin and Missaou, which is a transformation of whatever type of RGB color space is in use.[5]
The sRGB gamut plotted within the cylindrical CIELCh color spaces. L is the vertical axis; C is the cylinder radius; h is the angle around the circumference. Left: CIELChab; right: CIELChuv
^ abIhaka, Ross (2003). "Colour for Presentation Graphics". In Hornik, Kurt; Leisch, Friedrich; Zeileis, Achim (eds.). Proceedings of the 3rd International Workshop on Distributed Statistical Computing, Vienna, Austria. ISSN 1609-395X.
^ abZeileis, Achim; Hornik, Kurt; Murrell, Paul (2009). "Escaping RGBland: Selecting Colors for Statistical Graphics" (PDF). Computational Statistics & Data Analysis. 53 (9): 3259–3270. doi:10.1016/j.csda.2008.11.033.
^Stauffer, Reto; Mayr, Georg J.; Dabernig, Markus; Zeileis, Achim (2015). "Somewhere over the Rainbow: How to Make Effective Use of Colors in Meteorological Visualizations". Bulletin of the American Meteorological Society. 96 (2): 203–216. Bibcode:2015BAMS...96..203S. doi:10.1175/BAMS-D-13-00155.1. hdl:10419/101098.
^ abZeileis, Achim; Fisher, Jason C.; Hornik, Kurt; Ihaka, Ross; McWhite, Claire D.; Murrell, Paul; Stauffer, Reto; Wilke, Claus O. (2020). "colorspace: A Toolbox for Manipulating and Assessing Colors and Palettes". Journal of Statistical Software. 96 (1): 1–49. arXiv:1903.06490. doi:10.18637/jss.v096.i01. S2CID 80628405.
^Sarifuddin, M. & Missaoui, Rokia (2005). A New Perceptually Uniform Color Space with Associated Color Similarity Measure for Content-Based Image and Video Retrieval(PDF). Multimedia Information Retrieval Workshop, 28th Annual ACM SIGIR Conference. S2CID 17570716. Archived from the original (PDF) on 2019-02-20.. Abstract/long-form corrected report
HCL (Hue-Chroma-Luminance) or LCh refers to any of the many cylindrical colorspace models that are designed to accord with human perception of color...
The CIELAB colorspace, also referred to as L*a*b*, is a colorspace defined by the International Commission on Illumination (abbreviated CIE) in 1976...
formula HCl Hypomania Checklist, a questionnaire used to screen for hypomania and bipolar spectrum disorders HCLcolorspace, a colorspace model designed...
{12-3u^{\prime }-20v^{\prime }}{4v^{\prime }}}\\\end{aligned}}} CIELChuv, or HCLcolorspace (hue–chroma–luminance) is increasingly seen in the information visualization...
A colorspace is a specific organization of colors. In combination with color profiling supported by various physical devices, it supports reproducible...
accompany it, and numerical HSL or HSV values describe a different color for each basis RGB space. Both of these representations are used widely in computer graphics...
lighting conditions. The HCLcolorspace seems to be synonymous with CIELCH. The CIE's most recent model, CIECAM02 (CAM stands for "color appearance model")...
"Overview of all RAL Design colours". Archived from the original on Nov 30, 2020. Official website Wikimedia Commons has media related to RAL-Color....
HCL Notes (formerly Lotus Notes then IBM Notes) is a proprietary collaborative software platform for Unix (AIX and IBM i), Windows, Linux and macOS, sold...
A color solid is the three-dimensional representation of a colorspace or model and can be thought as an analog of, for example, the one-dimensional color...
the typical "vegetation in red" false-color images. False color is used (among others) for satellite and space images: Examples are remote sensing satellites...
shading, subtle manipulation of value. In some colorspaces or color systems such as Munsell, HCL, and CIELAB, the lightness (value) achromatically constrains...
reproduce a fraction of the colors possible with a trichromatic colorspace, such as for human color vision. The name of the model comes from the initials of...
colorimetry, the Ostwald color system is a colorspace that was invented by the Baltic German chemist Wilhelm Ostwald. Associated with The Color Harmony Manual...
Blackness) is a cylindrical-coordinate representation of points in an RGB color model, similar to HSL and HSV. It was developed by HSV’s creator Alvy Ray...
muriatic acid or spirits of salt, is an aqueous solution of hydrogen chloride (HCl). It is a colorless solution with a distinctive pungent smell. It is classified...
chlorine produces a flame and in the process emits gaseous hydrogen chloride (HCl) as the combustion product. Another of many possible chemical combinations...
short wave ultraviolet light, appearing bright blue to bluish white in color. The more rarely seen clear to white benitoite crystals fluoresce red under...
consumption Locally Compact Hausdorff space, a term used in mathematics HCL colour spaces, a category of colour space models also referred to as LCh LCHab...
fusible at 3.5 on Wolfgang Franz von Kobell's fusibility scale, and soluble in HCl. It commonly contains or is associated with grains of pyrite. Lazurite is...
These targets consists of 24 grey fields and 264 color fields in 22 columns: Column 01 to 12: HCLcolor model, which differ in Hue, Chroma, and Lightness...
HI + I2 ⇌ HI3 HI3 is dark brown in color, which makes aged solutions of HI often appear dark brown. Like HBr and HCl, HI adds to alkenes: HI + H2C=CH2...
burning in chlorine also produces a flame, producing hydrogen chloride (HCl). Other possible combinations producing flames, amongst many, are fluorine...
the Rainbow". HCL Wizard. Retrieved 14 August 2019. Meyer, Morton A.; Broome, Frederick R.; Schweitzer, Richard H. Jr. (1975). "Color Statistical Mapping...
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