I have just converted RGB-TIF images to RGB-ECW for reasons of space and performance in ArcGIS. However, after the conversion, there are relics outside of the images which are not nodata values but have the values 0,1,0 or 1,1,0 or 1,2,1 etc. All very low values which are shown as black remnants after I set nodata values to transparent. (See attatchment)
I have ArcInfo and FME at hand and would like to either change these rgb values to 0,0,0 or clip all values outside of the aerial extents. Could anyone offer a tip on the most efficient way to achieve this?