Thanks very much again, Jim-
Yes, I definitely applied Photometric Color Combination in PI to the RGB after RGBCombination, applied to everything to try to get accurate color (and have been using PCC since it came out for that reason). All the PI photometric routines and databases worked fine on this data (once I corrected a center coordinate that somehow was off in the Fits Header). I did notice the blue content in the upper nebulosity area and just guessed that it was evidence of the strong OIII signal in NB versions that provides superior contrast between the "fighting dragons" and their background nebulosity.
Edited by jeffweiss9, 28 December 2020 - 11:07 PM.