SUMMARY I have a large number of slides that I am scanning, and because they are backlit when scanned, the over scan comes out a near black. Autocrop refuses to work on these, and I have to do every one of them manually.
You want mean that scanned image has a black frames around ? Like this one: https://docs.digikam.org/en/_images/editor_autocrop.webp ... taken from the docmentation: https://docs.digikam.org/en/image_editor/transform_tools.html#cropping-a-photograph The autocrop algorithm is designed to crop black frames not white frames. Gilles Caulier
Maybe provide a sample image. A test here with a image and a black frame works without any problems. Maik