Some years ago, we had an addition to our family and I took a lot of photos in that time. During the months I had taken nearly 2000 images of the newborn, but most of them had red-eyes on it.
This happens quite a lot with little children since their pupils don't close that fast and the light of the camera flash is reflected by the eye.
It always annoyed me to remove the red-eyes by hand, although most image software can do this with a single click in the defective image region.
This is a companion discussion topic for the original entry at https://www.digikam.org/news/2008-11-10_new_kipi-plugin_automatically_remove_red-eyes_in_batch_mode/