Author Topic: Eliminate Satellite Streak  (Read 7545 times)

Offline vpcirc

  • Newcomer
  • Posts: 32
    • View Profile
Re: Eliminate Satellite Streak
« Reply #15 on: 2015 April 02 13:33:35 »
Why does this have to be so complicated? I have to calculate formulas for pixel math? I love PI, but this is it's greatest weakness. One frame in a stack of 15 has a trail and it appears in the final stack? In CCDStack i could simply paint that area out and the data would be filled in from the average of all the other values in the frames. Things like pixel math, while great if you're an math expert, are confusing as it gets many new users discouraged from using PI. This would be the greatest program in the world for astroimaging if they'd just fix the broken UI

Offline georg.viehoever

  • PTeam Member
  • PixInsight Jedi Master
  • ******
  • Posts: 2132
    • View Profile
Re: Eliminate Satellite Streak
« Reply #16 on: 2015 April 03 03:13:30 »
Hi Vpcirc,

eliminating satellite  trails in PI is usually easy, using the pixel rejection in ImageIntegration. I have no idea why this did not work for the OP in this case.

PI generally frowns upon "painting" (i.e. inventing data). If you are into painting astrophotos, there are tools that are more powerful than PI. If you want to show what is in your data, then PI is the right tool.

Georg
Georg (6 inch Newton, unmodified Canon EOS40D+80D, unguided EQ5 mount)

Offline pfile

  • PTeam Member
  • PixInsight Jedi Grand Master
  • ********
  • Posts: 4638
    • View Profile
Re: Eliminate Satellite Streak
« Reply #17 on: 2015 April 03 13:51:23 »
Georg, i think the OP's problem was that the streaks were not terribly bright, and there were too few subs for the rejection algorithm to really work right. i have definitely had that problem before.

rob

Offline NKV

  • PTeam Member
  • PixInsight Guru
  • ****
  • Posts: 677
    • View Profile
Re: Eliminate Satellite Streak
« Reply #18 on: 2015 April 03 22:35:42 »
 :)

Two hours of Orion.

Offline silentrunning

  • Newcomer
  • Posts: 30
    • View Profile
Re: Eliminate Satellite Streak
« Reply #19 on: 2015 April 20 14:57:24 »
I have tried this to remove a satellite trail but when I create a PixelMath with just a good image in it and then drop it onto the bad image with the mask on it I just get the second image each time. What actually is the defined action for PixelMath when an image is dropped onto another one?

Many thanks

Doug

Offline MikeOates

  • PixInsight Addict
  • ***
  • Posts: 278
    • View Profile
Re: Eliminate Satellite Streak
« Reply #20 on: 2015 April 21 10:51:06 »
I took a sub last night with two bright satellite tracks and I thought, never mind I will use that new method of removing them, only it didn't.

The trails are not straight, but have a slight curve, so it make is worse by adding another trail :( Hopefully the rejection when integrated will remove them.

Mike

Offline Macstronomy

  • Newcomer
  • Posts: 7
    • View Profile
Re: Eliminate Satellite Streak
« Reply #21 on: 2018 November 23 10:45:11 »
I am new to PI and came across this 'old' topic in my search for direction on removal of Sat Trails in images.  So just wanted to say thanks to all for these posts - I got there after a few failures and have removed the trail.  I am always grateful to everyone who posts answers for newbies like me to benefit from.

Offline JB Gayet

  • Newcomer
  • Posts: 11
    • View Profile
Re: Eliminate Satellite Streak
« Reply #22 on: 2018 December 06 00:53:51 »
Hi all, a bit of post necromancy, but I am failing to apply this beautiful solution :


With the PixelMath expression ~d2seg(427,350,154,297)
you get a black image with a white line in it exactly where the satellite trail sits in the original image.
(you have to tag "Create new Image!)
Use this black image with the line as a mask over the "trailed" image.
Now you simply create another PixelMath with only the name of one of the 6 images without trail in it.
(Everything only with registered images)

Drag and drop this PixelMath triangle over the image with the trail gets you correct data
where the satellite trail was. Everything else stays unchanged.

Gerald

here, my concern is to "remove" ice on the lower right corner of my image . I could create a rectangle covering this surface, make a mask of it, but when I try to Drag&Drop the triangle, it replaces the whole image despite the mask. Where did I go wrong ? :)

Thank you in advance for your help :)

PS : I linked a screeshot of what I did :)

Offline RickS

  • PTeam Member
  • PixInsight Jedi
  • *****
  • Posts: 1298
    • View Profile
Re: Eliminate Satellite Streak
« Reply #23 on: 2018 December 06 01:16:13 »
The mask only has an effect if you replace the image.  If you create a new image then the mask is ignored.

Offline JB Gayet

  • Newcomer
  • Posts: 11
    • View Profile
Re: Eliminate Satellite Streak
« Reply #24 on: 2018 December 06 01:56:10 »
WOW thank you for this quick and excellent answer :)