Sh2 142 aka NGC7380 - Emission Nebula
in Cepheus - Ha+OIII+RGB
The
above image is done in PixInsight using the Foraxx script then layering
the RGB image over the Foraxx result. Some tweaks and cleanup in
Photoshop.
Next is the image done "Old school" in Photoshop
using layers and Lighten Blend Mode and toggling each layer's colour
mapping to assign Ha to Red and a bit to blue and OIII to Green and
Blue.

And here is the RGB before the H-Alpha or OIII data was added:

Here is the starless H-Alpha component alone:

Emission Nebula in Cepheus - Sh2-142 aka NGC7380
Camera: Apogee U16M with Astrodon Gen II RGB and 5nm
H-Alpha and OIII
filters
Scope: 12.5" Planewave CDK
Mount: Paramount ME
Exposures: RGB: 12/12/13 x 10min; OIII 20 x 20min; H-Alpha: 20 x 20 min
Acquired with TSX orchestrated by CCD-Commander
Lucknow, Ontario
Sept 2025
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