White Balance

For object color changes along with luminance, there are different color-temperatures of images coming from different illumination conditions. For instance, tungsten lamp illumination makes image turn yellowing. Generally speaking, CCD cannot auto-adjust luminance as human eyes do. So in order to justify deviation made by light ray, we can use White Balance skill to adjust intensity of three colors (red, green, blue) according to the standard of image present. In addition to auto-WB and fixed temperature of color, some cameras also provide manual-WB-adjustment function.