"When you need to apply the same action to multiple
photos, digiKam's batch processing capabilities can come in rather
handy. And the photo management application provides different ways
to apply actions to a photo batch in one fell swoop.
"For starters, you can perform certain actions on all photos in
a specific album. To do this, right-click on the desired album, and
choose the action you want from the Batch Process context menu. The
actions available in the menu include Image Effects, Recompress
Images, Resize Images, DNG Converter (lets you convert RAW files
into the DNG format), and Batch RAW Converter (allows you to
process the RAW files using the Batch RAW Converter tool)."