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2012: VdB 152; Reflection nebula and Dust Lanes in Cepheus
Image details
Date: August 19 and 21, 2012
Exposure: 5 hours 40 minutes  (34x10 min), ISO 800, 18 Darks, 20 Bias, and 16 Flats

Telescope: 8" Skywatcher Newton @F/5 with MPCC 
Mount: NEQ6-pro, controled by EQmod/CdC, guided by  QHY5/9x50 Finder Guider/PHD
Camera: Peltier-cooled Canon 350Da (+10C; Ambient temp +25-35C) 
Location: Ucel (near Aubenas), France

High resolution: (2,72 Mb)
DSLR-LLRGB post-processing workflow  according to Scott Rosen's video tutorial:
 
Original RGB image in Nebulosity 2.5:
  -DDP using standard settings [DDP]

Original CB/DDP RGB image in Photoshop CS3:
 -Levels [Black-, Grey-, and White points]
 -Gradient eXterminator (1st pass Medium - Low, followed by 2nd pass High - Medium)
 -Convert to greyscale [This creates the Synthetic Luminance]
 -Convert back to RGB [RGB reconvertion is only done for easy of interpretation of PS histgram and tools]
 
Synthetic Luminance in Photoshop CS3:
 -Carboni's v1.6 Deep Space Noise Reduction [Removes noise from background, not DSO]
 -Curves, selective on weak dustlanes, with ancored background and highlights, 2x normal curve, followed by repair of contrast in highlights, in this case the little reflection nebula, by a selective curve using layer masks,1x normal and 1x contrast curve
 -Carboni's v1.6 Deep Space Noise Reduction [Removes noise from background, not DSO]
 -Screen Mask Invert to pull out the weak dust lanes even further from the backgroud
 -Highpass Filtering on the Iris'scenter using a layer mask
 -Carboni's v1.6 Vertical Banding Noise Reduction
 -Final tweaks on Luminance using Curves
 
RGB processing in Photoshop CS3:
 -Curves and Levels to bring RGB to a comparable level as the Luminance
 -HLVG, medium strength
 -Carboni's v1.6 Space Noise Reduction
 -Carboni's v1.6 Less Crunchy, More Fuzzy
 -Increase saturation using Adam Block's method [3 copies of RGB, 3rd copy Luminosty blend mode, 2nd copy soft light blend mode, flatten all 3 copies] Repeat to taste, 3x for this image. This results in a slightly over saturated image
 -Luminance addition on 30% opacity, Luminosity blend mode, flatten
 -Carboni's v1.6 Less Crunchy, More Fuzzy
 -Gaussian Blur (2px)
 -Selective Color (Reds/Yellows/Blues)
 -Increase saturation using Adam Block's method [3 copies of RGB, 3rd copy Luminosty blend mode, 2nd copy soft light blend mode, flatten all 3 copies] Repeat to taste, 2x for this image.
 -Luminance addition, blend mode Luminosity, at 60% opacity, flatten
 -Carboni's v1.6 Less Crunchy, More Fuzzy
 -Gaussian Blur (2px)
 -Increase saturation using Adam Block's method, 1x
 -Luminance addition on 100% opacity, Luminosity blend mode [The general idea is to increase the saturation of the RGB stepwise, until the luminance can be added at 100% opacity]

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