Clipping Ortho (.sid) Files-ArcView10

Discussion created by terrydan on Feb 16, 2011
Latest reply on Mar 9, 2011 by phmurphy
I am NEW to GIS and am having a problem with some ortho images.

I have ortho images for the 8 counties we serve but those images overlap and have irregular black borders. I'd like to clip them using county shapes stored in layer files.
I tried to do this but end up with a polygon output as shown in the attachment
I would appreciate any help you can offer.