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Does adding a pedestal in WBPP work with the selective rejection technique?

Remco HekkerRemco Hekker
in PixInsight

Hi everyone,

If I apply a pedestal in WBPP, and I also wan to selectively reject artifacts in some of my subs? Can I apply the blackout in the original subs, or should I perform the rejection after calibration and debayering instead?

For context:
I'm working on an HOO image with RGB stars using a OSC camera and an Optolong L-eXtreme filter. My subs are 1200s each and look great—except for the first night, where I noticed micro-lensing around the brightest star. I later mitigated this by stacking an Astronomik Luminance filter in front of the L-eXtreme.

Despite the issue, I’d like to use as much of the first nights data as possible. By selectively rejecting the micro-lensing artifacts. I only have 15 affected subs, so I plan to handle them manually. However, since I’m applying a pedestal in WBPP, I’m unsure if this will interfere with the rejection process.

Any insights would be greatly appreciated!

Comments

  • BlockHeadBlockHead
    The pedestal will not affect the rejection. The pedestal is simply an offset used when calibrating (subtracting a dark frame). Rejection occurs much later. You should apply the zeros to the debayered (or registered, whichever is easier) images. It does not make sense to apply zeros to un-debayered images. This will interfere with the de mosaicing.

    -the Blockhead
  • Remco HekkerRemco Hekker
    Ah, thank you Adam! I forgot about the debayering effects. And it would definitely make my life easier zeroing the registered images. I could then simply make one mask for the entire set.

    You just saved me a lot of work. Thank you!
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