Other algorithms check for biases in the wavelengths of incoming light; these indicate the presence of fluorescent lighting, which gives a green cast, or tungsten( incandescent) lighting, which gives a yellow cast.

• 其他的演算法则会检查入射光线波长的偏差值；这种偏差说明了为什麽在日光灯照射下的颜色会偏绿，而在钨丝灯的环境下则偏黄色。