NGC 1499 - 2 Panel Mosaic

D

dhickey

Active member
This is a 2-panel mosaic of NGC 1499 using an AT130EDT refractor at 728mm focal length with an ASI1600MM camera for an image scale of 1.08"/pixel. Baader 7nm HA, Baader 8.5nm SII, and Chroma 3nm OIII. Each panel is about 30x300s HA, 78x300s OIII, and 30x300s SII under Bortle 8 skies. I've processed this almost a dozen times and never really come out with a color blend that's what I had in mind based on some other SHO images I've seen on AstroBin. Particularly the ones with bright bands of red, gold, green, and blue - although most of those are under darker skies and a single panel with a shorter focal length. I'll readily admit that my dog has more artistic ability than I do. The attached version is the least gaudy and overprocessed I've managed so far. The processing in this latest version included:
  • PhotoMetricMosaic script to create the mosaic panels for each filter (which worked very well I think!)
  • MaskedStretch to stretch each filter master with a background of 0.150
  • PixelMath for a straight SHO combination
  • HDRMultiScaleTransform with 6 layers, one iteration
  • SCNR for 90% green subtraction
  • Multiple iterations of CurvesTransformation to increase contrast and boost saturation
  • BackgroundNeutralization (probably should have done that earlier...)
  • Several more iterations of CurvesTransformation
The stacked masters for each filter with the mosaic panels combined are here (each individual panel had DBE run before running PhotoMetricMosaic to combine them):
https://1drv.ms/u/s!AnQ9SObeCXLkskIq5ri-eT73Lz0m

The full image is here:
https://www.astrobin.com/v3xxb5/?nc=user

Any advice is most appreciated!

Thanks,
Dave

NGC1499_SHO_downsample2x2.jpg
 
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