Celestial hemisphere:  Northern  ·  Constellation: Cassiopeia (Cas)  ·  Contains:  27 gam Cas  ·  IC 59  ·  IC 63  ·  LBN 620  ·  LBN 622  ·  LBN 623  ·  LBN 625  ·  LDN 1306  ·  Sh2-185  ·  The star Navi (γCas)  ·  gamma Cas nebula
IC63 The Ghost of Cassiopeia, Kyle Desrosier
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IC63 The Ghost of Cassiopeia

IC63 The Ghost of Cassiopeia, Kyle Desrosier
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IC63 The Ghost of Cassiopeia

Equipment

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Acquisition details

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Description

Processing Details

Pre-processing (per channel)
  • Blink
  • ImageCalibration
  • CosmeticCorrection
  • SubframeSelector
  • StarAlignment
  • ImageIntegration
  • DrizzleIntegration
  • DynamicCrop

Linear Processing (Ha)
  • Removed large star halo (Charles Bracken's method)
  • DynamicBackgroundExtraction
  • Deconvolution: DynamicPSF, star mask for local support, masked w/ nebula mask
  • TGVDenoise: luminance for local support, masked w/ inverted low contrast mask
  • MultiscaleMedianTransform: luminance NR, masked w/ inverted low contrast mask

Linear Processing (R)
  • DynamicBackgroundExtraction

Linear Processing (G)
  • DynamicBackgroundExtraction
  • LinearFit to R

Linear Processing (B)
  • DynamicBackgroundExtraction
  • LinearFit to R

Non-linear Processing (Ha)
  • HistogramTransformation: initial stretch
  • ACDNR: inter-stretch histogram compression, masked w/ low dynamic range mask
  • HistogramTransformation: final stretch

Linear Processing (RGB)
  • ChannelCombination
  • BackgroundNeutralization
  • ColorCalibration
  • TGVDenoise: luminance for local support, masked w/ inverted low contrast mask
  • MultiscaleMedianTransform: chrominance NR, masked w/ inverted low contrast mask
  • MultiscaleMedianTransform: luminance NR, masked w/ inverted low contrast mask
  • NBRGBCombination: Mixed in Ha
  • BackgroundNeutralization
  • ColorCalibration
  • SCNR: Green
  • MultiscaleMedianTransform: chrominance NR, masked w/ inverted low contrast mask
  • MultiscaleMedianTransform: luminance NR, masked w/ inverted low contrast mask

Non-linear Processing (RGB)
  • HistogramTransformation: initial stretch
  • ACDNR: inter-stretch histogram compression, masked w/ low dynamic range mask
  • HistogramTransformation: final stretch

Non-linear Processing (HaRGB)
  • LRGBCombination
  • MultiscaleMedianTransform: chrominance NR, masked w/ inverted low contrast mask
  • MultiscaleMedianTransform: luminance NR, masked w/ inverted low contrast mask
  • LocalHistogramEqualization: large scale structures, masked w/ nebula mask
  • LocalHistogramEqualization: small scale structures, masked w/ nebula mask
  • CurvesTransformation: masked w/ screened nebula mask
  • ExponentialTransform: masked w/ screened nebula mask
  • MultiscaleMedianTransform: chrominance NR, masked w/ inverted low contrast mask
  • MultiscaleMedianTransform: luminance NR, masked w/ inverted low contrast mask
  • MorphologicalTransformation: reduced star sizes, masked w/ star mask
  • HistogramTransformation: darkened background sky

Comments

Revisions

  • IC63 The Ghost of Cassiopeia, Kyle Desrosier
    Original
  • Final
    IC63 The Ghost of Cassiopeia, Kyle Desrosier
    B

B

Description: Full reprocess. Significant workflow changes:
1. Performed ImageCalibration with dark optimization off, which properly removed amp glow and allowed me to use the full field of view
2. Integrated more of the raw data
3. Mixed in Ha into RGB with NBRGBCombination script instead of mixing it into R before RGB combination

Uploaded: ...

Sky plot

Sky plot

Histogram

IC63 The Ghost of Cassiopeia, Kyle Desrosier

In these public groups

/r/astrophotography