White balance refers to the process of removing or neutralizing color casts in your images. most light sources produce a color cast. And while our eyes are pretty good at correcting for this in real time, a camera captures the subject as it looks in life: sometimes neutral, yes, but sometimes very blue and sometimes very yellow (as in the pear photo below). In both the blue and the yellow cases, white balancing is necessary to create a neutral image. natural light only requires correction along the blue-yellow spectrum, but certain types of artificial lighting may produce a noticeable color tint, in which case you’ll need to correct for that, too. Photographers refer to different color temperatures using the Kelvin scale. Warmer color temperatures, such as those produced by a candle flame or a setting sun, have a low Kelvin value, such as 3000 K. Neutral color temperatures, such as midday sunlight, have a medium Kelvin value around 500 And cooler color temperatures, produced by clouds or shade, have a high Kelvin value of 6000 K and beyond.

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1. the main light is used for source of energy for the photos to come out better 2. this is used to fill in shadows of the photos 3.Flat Lighting, Butterfly Lighting, Loop Lighting . Rembrandt Lighting , Split Lighting