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.
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This is a companion discussion topic for the original entry at https://digikam.org/news/2012-04-04_simple_toning_in_digikam/