Cleaning edges of raster

Discussion created by krosemanp on Sep 30, 2013
Latest reply on Oct 8, 2013 by hlzhang1022
I have a compressed 3-band SID image with "unclean" whitespace (not NoData) on the edges. I want to set the space between the black area (actual image) and the footprint (light green lines) to NoData or to a single value (255,255,255 or 0,0,0).

The attached image explains the result I am looking for. I used a stretched symbology with min value 250 (black) and max 255 (white) to show the "garbage" along the edge.

What would be the best process to use to clean these images?