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Question About Debayer Process

Nick KohrnNick Kohrn
edited February 2021 in PixInsight
I have been following along with FastTrack: Debayer and Discover the Pattern, using data that I acquired from someone. The data was captured with a CMOS chip (Canon T6i). I was able to find the Bayer pattern of RGGB. After applying the Debayer algorithm with VNG, I noticed hot pixels in the shape of a plus symbol. However, in the tutorial video, the hot pixels didn't share the same pattern. I followed the URL to the supplemental video for the tutorial, PixInsight: StarAlignment, Debayering and Hot Pixels!, and it seems that I may need to perform cosmetic correction. But, at this point, I am not sure. I'm new to PixInsight, so it feels a bit confusing right now.

One reason I think that this may be fine is that I have not yet calibrated my data, so there has been no subtraction of data from darks, which I do have. I assume that my issue will be rectified in upcoming steps, but I want to validate that here.

In the attached image, you can see a red hot pixel. The steps that I performed up to this point are as follows:
  1. Apply screen transfer function
  2. Discover Bayer pattern
  3. Execute Debayer algorithm
Am I on the right track in thinking that this issue may be resolved after proper calibration in upcoming steps?

imageimage
CleanShot 2021-02-15 at 19.22.55@2x.png
2376 x 1580 - 410K
CleanShot 2021-02-15 at 19.26.11@2x.png
1584 x 930 - 171K

Comments

  • BlockHeadBlockHead
    I agree. If you still see these in your data after calibration it could "bite" you later. The problem isn't that they would be rejected during Image Integration (they probably would)...but the prior step of StarAlignment is the issue. If the StarAlignment things those are stars...then you get all kinds of trouble! It is best to remove them and save yourself the headache. You can control CosmeticCorrection to be as aggressive or conservative as you would like. So, I consider CosmeticCorrection a *standard* workflow step for all data. If there aren't any qualifying hot pixels...fine! 

    -the Blockhead
  • Nick KohrnNick Kohrn
    @BlockHead Thank you for providing assistance!

    Additionally, I see that there is an update to WBBP. Do you recommend that I continue to follow the steps in the FastTrack course, or should I watch your newly-released WBPP videos in place of the training videos and supplemental YouTube videos listed in the course?
  • BlockHeadBlockHead
    I attempted to silently update FastTrack.... perhaps you could re-review the section?
    -the Blockhead
  • Nick KohrnNick Kohrn
    @BlockHead Oh, great! I will re-review that section. Thanks so much!
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