Celestial hemisphere:  Northern  ·  Constellation: Canes Venatici (CVn)  ·  Contains:  IC 4263  ·  M 51  ·  NGC 5169  ·  NGC 5194  ·  NGC 5195  ·  NGC 5198  ·  Whirlpool Galaxy
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M51 work, Kenward Vaughan
M51 work
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M51 work

Revision title: Process using separation of stars/galaxies

Getting plate-solving status, please wait...
M51 work, Kenward Vaughan
M51 work
Powered byPixInsight

M51 work

Revision title: Process using separation of stars/galaxies

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Comments

Revisions

  • M51 work, Kenward Vaughan
    Original
  • M51 work, Kenward Vaughan
    B
  • M51 work, Kenward Vaughan
    C
  • Final
    M51 work, Kenward Vaughan
    D

B

Title: Process with no separation of stars/galaxies

Description: Stretching was controlled as well as possible to minimize background while bringing out fainter trails of NGC 5195 and M 51.

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C

Title: Process using separation of stars/galaxies

Description: Stretching used masked stretch followed by arcsinh stretches, with stars separated. Found that excess background red could be removed via pixel math for both parts but later added SCNR at the end with a nice mask to finish that off. Recombination used a power equation which de-emphasized the stars, especially over the galaxies.

Further work continues on stretching as well as the timing of various processes (e.g. best point to initially sharpen the image--I have found each choice comes with a compromise).

Uploaded: ...

D

Title: Process using separation of stars/galaxies

Description: This is actually a revision of my original final--Astrobin wouldn't handle an update of that image.)

Stretching used masked stretch followed by arcsinh stretches, with stars separated. Found that excess background red could be removed via pixel math for both parts but later added SCNR at the end with a nice mask to finish that off. Recombination used a power equation which de-emphasized the stars, especially over the galaxies.

Further work continues on stretching as well as the timing of various processes (e.g. best point to initially sharpen the image--I have found each choice comes with a compromise).

Uploaded: ...

Sky plot

Sky plot

Histogram

M51 work, Kenward Vaughan