I have a set of aerial images that need to be geo-referenced and will be used in outside of ArcMap. So simply adjusting the display properties won't cut it. Because of this I need to find a solution that permanently removes the unwanted border (slivers) and updates the world file. Any help would be great. Thanks.
Create a polygon of your image area and use Spatial Analyst>Extract>Extract by Mask. If you need a world file you might need another process. I think you did it in Catalog at 9.3, but now with GDAL as the base I think you might get one by default with a tif. Don't know if that "clipping geometry" option is new, I always thought that tool was useless as it only could extract square extents. I have definitely never seen the other option put forward using a selected graphic. Thanks Robert.