DescriptionThe Horsehead Nebula is one of the most famous nebulae on the sky. It is visible as the dark indentation to the red emission nebula in the center of the above photograph. The horse-head feature is dark because it is really an opaque dust cloud that lies in front of the bright red emission nebula. Like clouds in Earth's atmosphere, this cosmic cloud has assumed a recognizable shape by chance. After many thousands of years, the internal motions of the cloud will surely alter its appearance. The emission nebula's red color is caused by electrons recombining with protons to form hydrogen atoms. On the image left is the Flame Nebula, an orange-tinged nebula that also contains filaments of dark dust. Just to the lower left of the Horsehead nebula featured picture is a blueish reflection nebulae that preferentially reflects the blue light from nearby stars.
PreprocessingApproximately followed
Light Vortex Astronomy method.
[list]
[li]Cosmetic Correction[/li]
[li]Weighting[/li]
[li]Star Alignment[/li]
[li]Local Normalization[/li]
[li]Image Integration (Linear Fit Clipping for all channels except Blue. Winsorized Sigma Clipping for Blue.)[/li]
[li]Drizzle Integration[/li]
[li]Star Align combined masters to luminance[/li]
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Luminance Processing:
Crop/Rotate
DBE
TGV Denoise (Jon Rista method)
MMT (Jon Rista method)
Masked Stretch
Tweaked stretch using Histogram Transformation
HDR Multiscale Transform
RGB Processing:
Crop/Rotate
ABE
Linear Fit Red & Blue to Green
Combine using Channel Combination
Photometric Color Calibration
SCNR removing 75% Green
Repair HSV Script
Very slight stretch using Arcsinh Stretch
More aggressive stretch using Arcsign Stretch
Tweaked stretch using Histogram Transformation
Apply luminance using LRGB Combination
Curves
EZ Star Reduction script
More Curves
Resample
Comments