Celestial hemisphere:  Northern  ·  Constellation: Cassiopeia (Cas)  ·  Contains:  NGC 281  ·  The star ηCas
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NGC 281, Tony Cook
NGC 281
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NGC 281

Getting plate-solving status, please wait...
NGC 281, Tony Cook
NGC 281
Powered byPixInsight

NGC 281

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Description

The Pac-man nebula

Version A: Basic processing to reduce chrominance and luminance noise after a DDP stretch (Images Plus).

Version B: Colour saturation applied to colour channels (via Photoshop Match Colour tool). Selective sharpening applied via Adaptive Richardson-Lucy deconvolution (Gaussian 5x5 PSF, 6 iterations in Images Plus) applied to luminance channel at 50% blend in PS

Version C: Needed to go back and apply a "brightest stars" mask to the star ηCas to prevent colour saturation adding a cyan border to the clipped core of the very bright star. As a general principle it is essential to protect white point clipped stars as the perimeter of the clipped region has distorted colour data that saturation procedures will highlight to the detriment of the image!

Comments

Revisions

  • NGC 281, Tony Cook
    Original
  • NGC 281, Tony Cook
    B
  • Final
    NGC 281, Tony Cook
    C

Sky plot

Sky plot

Histogram

NGC 281, Tony Cook

In these public groups

Cloudy Nights