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Colour spaces

Perceptual color space is an alternative way to represent real color images in a way that is more natural to human perception and understanding of color than RGB representation. There are many alternative color representations, but here we concentrate on the Hue, Saturation and Value (HSV) color space which is popular in image analysis applications. This change in the color space follows a perceptually acceptable color gradient. From an image analysis perspective, this allows for color separation from exposure to a higher degree. RGB images can be converted to HSV color space representations as shown in Figure 1.9.

Each of these three parameters can be interpreted as follows:
H (hue) is the dominant color wavelength, i.e. red, blue, green.
S (saturation) is the ‘purity’ of a color (in the sense of the amount of white light mixed with it).
V (value) is the brightness of the color (also known as luminance).

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