This paper describes the dependency of noise perception on background color and luminance of noise quantitatively. We conduct subjective and quantitative experiments for three noise models, using a modified grayscale method. The subjective experiment results show the perceived color noise depends on the background color, but the perceived luminance noise does not. The most sensitive background colors for color noises are yellow and purple. The perceived noises against background gray level show the similar trend between noise models. When the background gray level is L*~25, we perceive the noise best. In addition, the perceived chromatic noise level is about 8 times smaller than the calculated color noise using CIELAB Euclidean distance.