In these models, colors of each hue are arranged in a radial slice, around a central axis of neutral colors which ranges from black at the bottom to white at the top. HSL (hue, saturation, lightness) and HSV (hue, saturation, value) are two alternative representations of the RGB color model, designed in the 1970s by computer graphics researchers to more closely align with the way human vision perceives color-making attributes. Before the electronic age, the RGB color model already had a solid theory behind it, based in human perception of colors. The main purpose of the RGB color model is for the sensing, representation and display of images in electronic systems, such as televisions and computers, though it has also been used in conventional photography. The name of the model comes from the initials of the three additive primary colors, red, green, and blue. The RGB color model is an additive color model in which red, green and blue light are added together in various ways to reproduce a broad array of colors.
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