A Bayer Filter mosaic, which is more popularly known as the Bayer Pattern is basically a color filter array that is more often than not used on RGB color filters to arrange them on a grid for photo sensors, which is usually square in shape. Most digital image sensors that are single chip in nature follow this particular arrangement of color filters. These digitized image sensors can be easily found in today's camcorders and digital cameras as well as printers and scanners and these are used to create a very colorful and bright image. The pattern of these filters is usually 25% each of blue and red and the rest 50% is made up of green. This is the reason why a Bayer Pattern is also known as GRGB and if one does the permutation in a different way, it is called RGGB.

This pattern was discovered by an employee of the then Eastman Kodak, Bryce E. Bayer. The different incoming lights are captured by the three different colored layers of filter and then, into the sensor array where the different colored light rays are separated and put into grids of a particular pattern. The green photo sensors are known as luminance-sensitive elements and the other two, i.e., the blue ones and red ones are together called chrominance-sensitive elements. The reason why twice the number of green pixels is used rather than the red and blue ones is because the human eye also has a similar pattern and in order to replicate that pattern of the human eye, Bayer framed the Bayer Pattern in that way and the results it produce are there for all to see.

The human eye is particularly sensitive towards green light than it is to blue light or even red light. Therefore, what Bayer did makes very good sense and even eye specialists have agreed with the arrangement of the pixels. Although it was relatively easy to come up with the idea of using twice the number of green pixels than red and blue, putting these in pixels in the perfect geometric pattern so that they would be distributed perfectly was the hard part and this is where lies the greatness of Bayer lies. He not only came up with the idea but also implemented it as well and it is because of the Bayer Pattern that we get such good quality pictures these days.