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Cosmetic correction unclear - Related to the OSC Comet processing video

Niki Haselwanter
in PixInsight
Hey There!

I have a question related to the video 

Comet Academy: OSC Comet Processing: WBPP


Right at the beginning Adam creates an instance of CC but without specifying a dark.
Now i searched for videos about CC and found a new (updated) version of Adam here 


My english is ok, but things get lost in translation from time to time os i have to ask here.

The question is when using wbpp and at cosmetic correction say manually like he does, what is the sence of that when there is no dark or masterdark used, and instead in the CC file he says automatic? 

I do not understand. Would it not be the same then, just to go for automatic in WBPP? 

Please explain that to me, thanks.

Niki

Comments

  • BlockHeadBlockHead
    Hi Niki,

    The two methods are different. The old method finds hot pixels in LIGHT frames based on how bright the pixels are compared to their neighbors. The new method (in WBPP) finds hot pixels by examining dark frames. 

    If you use the new method it does require dark frames (or a master dark). If you do not have dark frames you cannot use the new method. 

    Because the two method are different- the will interact with the data differently. As an example if you use the Automatic CC (old method) on undersampled data, CC can destroy (affect) some stars. However, this will not help with other method since the hot pixels come from dark frames and no light frames are analyzed.

    -the Blockhead
  • Niki Haselwanter
    Hey!

    OK, i get that. But it does not explain to me why adam uses the cc in wbpp in manual mode, but NOT set a dark or masterdark there. 
    So what is the benefit of using manual and then specify "AUTO" in CC, instead of just using automatic direct in WBPP? 

    Niki
  • BlockHeadBlockHead
    I do not understand. The new method is NOT the same as the old CC process. You do not need to set a dark frame in WBPP. It will automatically use from the master dark that is created from the darks you load into WBPP. I do not understand what you mean by "manual"

    If you are using the old method of CC in WBPP.. you cannot select dark frame there. You can only use a CC instance/Template with the AutoDetect method.

    I am sorry... we are talking in circles. I think we need a picture.
    -the Blockead
  • BlockHeadBlockHead
    One more thing... 

    In WBPP the word "AUTOMATIC" is NOT the same as the "manual" CC with AUTODetect method.
    "AUTOMATIC" in WBPP is using a dark frame. That is the new method.

    If this isn't the confusion..I am very confused.

    -the Blockhead
  • Niki Haselwanter
    Yeah, its hard to understand what i mean. 

    I DO understand that you are saying if i use wbpp AND have Darks (what i always use) then i DO NOT have to use a the template. OK, get that.

    What i do not understand here is why is Adam doing it then?

    And to go further, in the template he uses, he uses "Automatic"

    And for your second answer, WHAT exactly IS the CC with Autodetect mode then?

    Niki

    See Screenshots.




    Bildschirmfoto 2024-10-01 um 18.40.19.png
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    Bildschirmfoto 2024-10-01 um 18.39.52.png
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  • BlockHeadBlockHead
    I think we need to be on the same page. Your screenshot is from an older version of PixInsight. This is not the newest version with the new option for CC in WBPP. 
    Can you please check and make certain you are using the latest version of PixInsight?

    The checked option is the NEW method. The template is the method you understand. Do you agree our screens are different?

    I think THIS might be the source of the confusion?

    -the Blockhead
    Screenshot 2024-10-01 114904.jpg
    373 x 211 - 22K
  • Niki Haselwanter
    Hi!

    No i am on the newest version of PI. 
    The screenshots are out of Adam Blocks Video as mentioned above.
    I did not try anything yet, i am just watching the videos.
    Since this vid seems to be a bit older, maybe its just done different now and i dont have to use the template like Adam does in the video at all.

    So its not really a problem i allready have, i was just not understanding why he does it the way he does.

    But so we can close this here now, since its just due to an outdated video.

    Thanks for your Help

    Niki



  • BlockHeadBlockHead
    I still do not think you understand. The videos you watched are still valid. The methods are different as I explain in the new video about the new method. So it is a good idea to understand both. 

    Creating an instance of CC (template) does not use dark frames. As I indicated above, it analyzes light frames only.

    The now available new method in WBPP uses dark frames only and does not look at light frames. 

    These are two different methods and my videos (both old and new) are both correct. YOU DO NEED TO USE THE TEMPLATE if you do not want to use the dark frame method. 

    You also might find the Template (AutoDetect) light frame method is easier to control the removal of hot pixels.

    -the Blockhead

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