This is referred to as "white balance" that according to the light source, is to be shot in color image is close to the eye. Normally, should be taken with the auto default. If you want to change the color of images taken, please change the white balance to match the light source and weather.
Automatic white balance adjustment. Recommended in most situations.
Use under incandescent lighting.
Use with the light sources listed on page 141.
Use with subjects lit by direct sunlight.
Use with the flash.
Use in daylight under overcast skies.
Use in daylight with subjects in the shade.
Measure white balance or copy white balance from existing photo.