I have two overlapping .ecw layers of the same area, though one is clipped in the middle, with a white edge. When I set the background value to 255,255,255, and define it as hollow, it only hollows that specific RGB value, when in reality, there are other "white" values in my layer, such as:
254,254,254; 253,253,253.. all the way to 249,249,249.
Is there a way to define the display background value to include more that one unique RGB set of values?
I know I can work around this (clipping, raster calculator, etc.), but I want to retain only one original .ecw file without producing duplicates, therefore I only want to use Arcmap symbology or image rendering tools.
What I need is exactly like the
Custom transparency options in QGIS, but for ArcMap.