© 2020 IEEE. It is common in color imaging to use a single-sensor system with a color filter array (CFA), especially a Bayer CFA. Recently, color filter methods using the white component have been studied to improve both resolution and sensitivity. However, de-mosaicking performance is improved using a correlation of color planes, especially for a Bayer CFA. We propose a new imaging system with a pastel-color CFA. In this system, the color plane reconstruction is realized with an abstraction of the white-like component from RAW images. To improve performance, we discuss the use of the highfrequency component. However, the effect of sensor noise on the imaging performance has not been closely investigated in such imaging systems. In this paper, we evaluate these effects on various imaging systems. In our experiment, the optical color filter and sensor noise are simulated using computer calculations. With these results, it is recognized that the proposed method is less affected by sensor noise.