Day is a kind of cold tone light is balanced filter.

The main features for micro absolute value is small, apply to adjust the light source color temperature.

Day light change the color of the amplitude and the effect is small, can be slightly elevated light source color temperature, because this kind of cold tone filter increases the effect of the light source color temperature slightly, so could be used in the correction of images taken by a slight tendency to partial red, orange, in order to get the real color reduction, can also be deliberately keep the light source color temperature, in order to achieve the effect of some kind of cold tone.

Sunrise moment of residential area, the low colour temperature (see photo A), added with day light, color temperature to normal (see photo B).