In imaging systems, light from self-luminous objects or objects illuminated by a light source is focused on the image sensor through an optics system such as a lens, and the optical image information is converted to an electrical image signal. The image signal is digitized by way of an analog noise reduction circuit and processed by a digital signal processor (DSP) to make it a color image signal. Spurious resolution around the Nyquist frequency and cross talk of light or signal charge between pixels are also space noise. DSP is a welcome tool that operates not only essential processing to create image data, but also compensates for the deficiencies of performance sensors, such as inadequate noise reduction. In a single-sensor camera system, only the light that passes through the color filter can contribute as sensitivity in the sensor. The other light is absorbed or reflected by the color filter.