The first revision of the digiKam Recipes book in 2020 is here, and it packs new content.
The latest version of digiKam features the Healing Clone tool, and the Remove dust spots and imperfections with the Healing Clone tool part explains how to use this supremely useful feature. Starting with digiKam 6.4, you can use external RAW processing engines, and the Process RAW files with UFRaw part provides information on how to work with RAW photos using the UFRaw tool.
This is a companion discussion topic for the original entry at https://digikam.org/news/2020-01-07_digikam_recipes_20_01_11/