HSL and HSV
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HSL and HSV are the two most common cylindrical-coordinate representations of points in an RGB color model. The two representations rearrange the geometry of RGB in an attempt to be more intuitive and perceptually relevant than the cartesian (cube) representation. Developed in the 1970s for computer graphics applications, HSL and HSV are used today in color pickers, in image editing software, and less commonly in image analysis and computer vision.
Fig. 13a. Color photograph (sRGB colorspace).
Fig. 13b. CIELAB L* (further transformed back to sRGB for consistent display).
Fig. 13c. Rec. 601 luma Y'.
Fig. 13d. Component average: "intensity" I.
RGB color model
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The RGB color model is an additive color model in which the red, green and blue primary colors of light are added together in various ways to reproduce a broad array of colors. The name of the model comes from the initials of the three additive primary colors, red, green, and blue.
Full color image along with its R, G, and B components
The first permanent color photograph, taken by Thomas Sutton in 1861 using James Clerk Maxwell's proposed method of three filters, specifically red, green, and violet-blue
A photograph of Mohammed Alim Khan (1880–1944), Emir of Bukhara, taken in 1911 by Sergey Prokudin-Gorsky using three exposures with blue, green, and red filters
RGB phosphor dots in a CRT monitor