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RGB color space

Color representation is complex. However, trichromatic theory states that color can be represented by 3 basic dimensions.

RGB is the most used system for image processing. It stands for Red/Green/Blue.

Figure 1: RGB color cube

Figure 2: RGB color cube seen from white (255,255,255)

Figure 3: RGB color cube edges

Other color spaces exist. HSI (Hue, Saturation and Intensity) is another popular color space. HSI is supposed to be more intuitive and to follow the actual eye color sensitivity.

Figure 4: HSI color cube

Lab is also another popular color space. The following figures shows the Lab color space scaled to 0-255. It is for illustration purpose since the conversion from RGB is non-linear and bound to errors.

Figure 5: Lab color cube

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