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Horizons: Narrow Band Rosette Nebula: Demonstration of Technique - MOD images didn't turn out
Adam,
I tried the technique for PixelMath w/ho_mod and hs_mod files and didn't get the results in the mod files. Of course, I was using it on my LSHO data (a small set, not very 'deep' image wise) of IC 5070, the Pelican Nebula.
Only 7 hrs integration time total, so not a large data set for monochrome narrow band. All pre/post processing was in PixInsight. The Sii (25x240s) was very very sparse, almost non existent compared to the L, Ha, and Oiii images.
So, I created the ho and hs mod images by multiplying the Ha starless, O3 starless, and S2 starless respectively per the video. The resulting HO_MOD and HS_MOD images were so dim I was tempted to stretch them again. The lack of signficant S2 data made the PixelMath setup almost moot; the only spot where S2 really showed up was along the edge of the Pelican head and that is where some orange/red gradiation was evident after following the PixelMath setup for using the _mod images. Given the sparcity of S2, I suspect a similarly based HOO processing may give better results for The Pelican Nebula. Suggestions?
I learned a lot from this, but I would like to see your take on NB Post processing when maybe only Ha or Oiii are the majority of the available narrow band image signal.
I tried the technique for PixelMath w/ho_mod and hs_mod files and didn't get the results in the mod files. Of course, I was using it on my LSHO data (a small set, not very 'deep' image wise) of IC 5070, the Pelican Nebula.
Only 7 hrs integration time total, so not a large data set for monochrome narrow band. All pre/post processing was in PixInsight. The Sii (25x240s) was very very sparse, almost non existent compared to the L, Ha, and Oiii images.
So, I created the ho and hs mod images by multiplying the Ha starless, O3 starless, and S2 starless respectively per the video. The resulting HO_MOD and HS_MOD images were so dim I was tempted to stretch them again. The lack of signficant S2 data made the PixelMath setup almost moot; the only spot where S2 really showed up was along the edge of the Pelican head and that is where some orange/red gradiation was evident after following the PixelMath setup for using the _mod images. Given the sparcity of S2, I suspect a similarly based HOO processing may give better results for The Pelican Nebula. Suggestions?
I learned a lot from this, but I would like to see your take on NB Post processing when maybe only Ha or Oiii are the majority of the available narrow band image signal.
Comments
I used an NB2RGB pixel math algorithm to get some believable RGB stars before adding them back in via Pixel Math (initial stars/starless versions were created with Star Xterminator).
My result(s) can be found here: https://astrob.in/5skzqs/H/