Below is an RGB image taken with a standard matrix filter consumer camera, showing how it is composed of three different monochrome images that are fed into the three colour channels, red, green and blue, by the image processing software. Also displayed is the greyscale image derived from the RGB image. Note that it is nearly identical to the green channel image. Green is at the centre of the visible wavelength range and the human eye is particularly sensitive here. Thus, the information content of the green parts of the images we see at daylight is usually particularly high.





HLS Channels
Decomposing the colour image into the three channels of the more abstract HLS colour space delivers less intuitive results. Only the lightness channel, which contains the information about the "blackness" or "whiteness" of the colours, is similar to the greyscale image.