[ Thanks to Michael for this link.
]
“Black and White images have been neglected ever since
the introduction of colour into film photography, due to the fact
that colour is best and what we see (colour) is the true beauty of
a scene/object. As this is the case now, whenever black and white
images are created it is perceived as a kind of artistic aesthetic
that the photographer has wanted to achieve and considering colour
is the norm now, this photograph is viewed in a different light and
more of an artists creation rather than the representative. So, I
hope to get you more creative in experimenting with your
photographs with these easy Black and White conversion processes!“Using the Channel Mixer
* Open your photograph up in GIMP.
* Go, Colors > Components > Channel Mixer
* Select Monochrome and leave Preserve Luminosity until the end
(optional).
* Now, you can experiment with the channels:”