If the black border around an image is too thick (roughly 1/4” thick or greater), Black Border Removal may not consider it a black border, but rather part of the image itself and will not remove it.

However, this border can be removed using the Region Extraction Page Processing feature located under the Administration | Modify Project in Data Group | Page Processing tab. Region Extraction can cause serious image damage if used improperly. Make sure it is configured properly before using it. See Manual.