Colour temperature represents the comparative relation of how a perfectly white sheet of paper would be observed under different types of light, its unit is expressed in Kelvin degrees.
Usually, 3 colour temperature groups are distinguished:
- Warm Light: (Colour temperatures between 2800ºK and 3500ºK). Equivalent to the light produced by incandescent bulbs and halogen bulbs.
- Neutral Light: (Colour temperatures between 3800ºK and 4500ºK) experts say that it is the most natural light.
- Cold Light: (Colour temperatures over 5000ºK). Equivalent to the light of a very sunny or cloudy day. One of the advantages of cold light is that at the same intensity it contributes a greater quantity of lumens which generates a greater perception of luminosity.
Low quality LED displays have fixed colour temperatures, since their electronics do not allow them to be customized. The most advanced LED screens have systems that allow image calibration at colour temperatures that range from 3,000 K to 6,500 K.
White Balance, WB is a control on different digital image reproduction devices that is used to balance the levels of the basic colours or red, green and blue (RGB) so that the brightest part of the image appears white, and the less bright black. If we perform a white balance correctly, those whites and blacks will be pure, they will not have any dominant colour. Otherwise, whites will have a bluish dominant in the case of LEDs that tend towards cool colour temperatures, or yellowish if they tend towards warm colour temperatures.