Transcribed from Dmitri Popov's blog, 4th April, 2012
Adding a dash of color tint to a black and white photo can often produce a dramatic effect, and digiKam does have a handful of toning filters for you to try.
But you are not limited to the built-in filters: using digiKam’s editing tools, you can easily tint photos using whatever color you like. To do this, open a photo for editing, chooseand set to -100. This effectively turns the image into a black and white photo. Press to save the changes, then choose . Use the sliders to create the toning color you want. Press , and you are done.