Hey,
I have been mosaicking another dataset from 2006 aerial photography (RGB, 3 band) and have run into a similar problem. In some cases I am still getting blue sections on my image in the shape of triangles (please see attached image in original thread) while in others I am getting these areas completely blanked out by white triangle shapes.
I have tried almost every possible combination of the "mosaic colour map" and "mosaic operator" defaults, however, nothing seems to be working. Sometimes a certain combination will reduce the number of blank areas to just one or two areas rather than three or four. However, I was hoping to have no blank areas as I am calculating changes in landcover betwen the 1977-2006 and this will affect my results.
Cheers and thanks for your time,
Chloe.