What is typically the composition of a color filter array (CFA) in cameras?

The composition of a color filter array (CFA) in cameras is primarily designed to mimic human vision, which is most sensitive to green light. By using a configuration that includes 50% green, 25% blue, and 25% red, the CFA aligns with the photopic response of the human eye. This sensitivity allows the camera to capture images that look more natural to human observers.

The higher proportion of green filters is essential as it contributes significantly to the luminance and detail of the resulting image. Since our eyes are notably more responsive to green wavelengths, this arrangement helps in effectively reproducing the brightness and contrast in photographs, resulting in more balanced and true-to-life colors. Thus, this composition optimizes the camera's performance in a wide range of lighting conditions, accurately rendering the colors of various subjects.