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Sh2 275 Rosette Nebula GHS Exercise, Jerry Yesavage
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Sh2 275 Rosette Nebula GHS Exercise

Revision title: GHS Saturation Stretch

Getting plate-solving status, please wait...
Sh2 275 Rosette Nebula GHS Exercise, Jerry Yesavage
Powered byPixInsight

Sh2 275 Rosette Nebula GHS Exercise

Revision title: GHS Saturation Stretch

Equipment

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Acquisition details

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Description

Have photographed this wonderful target several times but this time I wanted to make it a test piece for color processing using GHS.  I have tried to follow Dave's suggestions especially from the latest presentation at the San Jose Astronomical Association

My take on the video is that there are the following main steps:

1.  Linear stretch setting the black point (also can be done with a GHS stretch: Set the SP to the left side of histogram;  b -> 15; move HP to SP; D cut the levels.. more complex)
2.  Choose peak value and set SP; set b to Max; Add D to fill in histogram; Can adjust SP
3.  Level additional humps seen in the Log histogram by setting SP on these humps
4.  Color enhanced by either Color stretch or Saturation stretch... need to work on this more

Examples:  Moon; Bodes; Dark Shark; Hercules Cluster

Discussed here.  (Bottom of Page 8)

Comments

Revisions

  • Sh2 275 Rosette Nebula GHS Exercise, Jerry Yesavage
    Original
  • Sh2 275 Rosette Nebula GHS Exercise, Jerry Yesavage
    B
  • Final
    Sh2 275 Rosette Nebula GHS Exercise, Jerry Yesavage
    C

B

Title: Destarred and RGB Stars Added

Uploaded: ...

C

Title: GHS Saturation Stretch

Uploaded: ...

Sky plot

Sky plot

Histogram

Sh2 275 Rosette Nebula GHS Exercise, Jerry Yesavage

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Sharpless2 Objects