Maybe i'm missing a basic concept when it comes to manipulating/removing values from an RGB orthophoto mosaic. Is it possible to completely eliminate the collar (black background) from an orthophoto mosaic that is in an ECW format. I was able to do in a TIFF format but the file needs to be in an ECW format as it is very large. I've had limited success, using FME, to accomplish this but the resultant file always has areas that are not removed. Hope all this make sense.
I'm open to other formats that will work, but as long as it performes to the same level as an ECW.
I have access to FME and ArcInfo.