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Funny star shape

Bruce Donzanti
in PixInsight
Adam

The Takahashi FSQ85-EDX is well known to create a so-called inverted lighthouse/hourglass effect on certain bright/large (as seen in the attachment).  Can you think of any approach in PI that could be utilized to make it appear more normal.  I do not want to remove it, just make it less noticeable.  

Comments

  • BlockHeadBlockHead
    I do not have a great suggestion.
    One thing you can take advantage of is that stars are round (reference quote needed).
    If the issue is on one or two stars... you can grab a preview around a star.
    Then you rotate the image. Then substitute this back in place with lighten (maximum) using pixel math.
    That should work.

    I know.. you don't believe me.
    Make the file available. It is a 10 second fix. But only works on a few stars.. you couldn't do this on a field of stars.

    -the Blockhead
  • Bruce Donzanti
    What do you need? A single fits frame or the complete final image?  I tried to attach several files, both as a single fits and jpeg, as well as zipped files but nothing is attaching.  
  • BlockHeadBlockHead
    You would make the master light frame available via a cloud server (Google Drive, OneDrive, DropBox...etc).
    Remember to set the permissions to *anyone that has the link* can get the file.

    -the Blockhead
  • Bruce Donzanti
    https://drive.google.com/file/d/1w8TN5KsOcthyCbHK4yyX-mmbJbGoU_Jr/view?usp=sharing


  • BlockHeadBlockHead
    This is what I get when I apply my trick.
    The lighten trick did not work... so I just did the clonestamp on the rotated image.

    Do you think this would make a good video to demonstrate?

    -the Blockhead
    Screenshot 2024-02-09 132237.png
    2299 x 1596 - 4M
  • Bruce Donzanti
    Yes, please! Many users of the Tak Baby Q scope would very much appreciate this. This looks excellent!!
  • Bruce Donzanti
    Adam

    I just watched the video and tried it on the Ha only image I sent you and then on the HOO version attached here.  Thank you- I am very pleased.  
    AB HOO_2_fixed star_crp.jpg
    6872 x 4385 - 3M
  • BlockHeadBlockHead
    Great!
    -the Blockhead
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