Comment by adolph

This done to enhance light gathering, right? Normal color CCDs have per-pixel filters so lose some light in order to gather the light at the same time?

  The most common method is to blanket the CCD pixel array with an alternating mask of red, green, and blue (RGB) microlens filters arranged in a specific pattern, usually the Bayer mosaic pattern. 

https://www.microscopyu.com/digital-imaging/introduction-to-...