The Elephant's Trunk Nebula (IC 1396) in the constellation Cepheus
11 hours and 45 minutes, processed in PixInsight with a little bit of tweaking in Mac Preview to adjust exposure and colors
The Cave Nebula (SH2-155) Ten hours of integration time PixInsight Processing of SHO images Standard process, but use dynamic background extraction instead of automatic channel extraction to work on RGB components with Histogram transformation and NoiseXterminator. SCNR 0.78. Luminance mask to darken background. Blurred color masks, use green to get goldish yellow nebula color and refinements using red and yellow masks, and brighten the blue background, apply NoiseXterminator again and DarkStructureEnhance
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