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SELECTIVE REJECTION PIXINSIGHT

Riccardo Civati
in PixInsight
Hi Adam,
I recently photographed the galaxy IC 342 but I noticed that in the green channel I find spikes in the background on half of the frames.
I performed the SELECTIVE REJECTION method but clearly I find the repaired part noisier.
I wanted to ask you if in the image integration settings I can overcome this problem by modifying some rejection parameters in PIXEL REJECT 1/2 AND LARGE SCALE PIXEL REJECTION.

in attached the images

CS
riccardo

Comments

  • BlockHeadBlockHead
    Yeah... the issue is the number of bad frames is a significant number of the good frames...so the integration of the good frames will necessarily have a worse S/N. This is just physics and math. There isn't a whole lot you can do about it. Later NXT will help since it does operate on the image in a tiled manner. 

    -the Blockhead
  • Riccardo Civati
    thanks Adam for the very quick reply!
    today I had an idea.
    I created 2 master greens: one made of all the frames, the other made only with the frames without the spike.
    Then I performed your trick on the scattered lights.
    I took the background with the spike and used it as a reference to the tgt background, then I gave a slight increase in noise and replaced the defective part. the result is perfect

    clear skies
    Riccardo
  • BlockHeadBlockHead
    OK! Great work!!
    That will help equalize the noise.
    Way to think like a blockhead...lol
    -the Blockhead
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