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I finally got around to trying Starnet in PI. I got the process module to load fine. It 'seems' to be working as it takes a long time to crunch the numbers.
But all I have been able to do so far is create a fairly good star mask. But cannot seem to get it to actually remove the stars.
Will the process work on an xisf image? Does it need to be converted to .tiff first?
What does the 'stride' setting do?
Any hints or tips are appreciated!
Tom
Current Equipment:
Mount: Celestron CGX-L
Scope: 130mm f7 APO
Cam: ASI071mc-pro
UlteriorModem wrote: ↑Sat Jan 18, 2020 2:42 pmI finally got around to trying Starnet in PI. I got the process module to load fine. It 'seems' to be working as it takes a long time to crunch the numbers.
But all I have been able to do so far is create a fairly good star mask. But cannot seem to get it to actually remove the stars.
Will the process work on an xisf image? Does it need to be converted to .tiff first?
What does the 'stride' setting do?
Any hints or tips are appreciated!
Congratulations on getting it up and running UM.
When you open the process in PI you will see a checkbox named Create starmask. Make sure it is NOT checked if you want to create a starless image.
The process does work on xisf images, so, no need to convert to .tiff.
You shouldn't have to change the 'stride' setting. The program actually breaks the image up into a checkerboard of sub images and works on them. Increasing stride will increase the amount of time required to process the image. Reducing stride may reduce the quality of the final result. This explanation may not be exactly correct, but, the changes in processing time are real.
Hope this helps.
Steve
Steve King: Light Pollution (Bortle 5)
Telescope + Mount + Guiding: W.O. Star71-ii + iOptron CEM40 EC + Orion Magnificent Mini AutoGuider
Camera: ASI 1600MM Pro + EFW Filter Wheel + Chroma 3nm Siii, Ha, Oiii + ZWO LRGB Filters
Software: PHD2; APT; PixInsight ***** My AP website: www.steveking.pictures
Yes, it only works on stretched images. And the Starmask checkbox needs to be unchecked.
My preferred procedure is to make a clone of the image. I apply Starnet to the clone, creating a starless image. Then I subtract the starless image from the original in PixelMath, giving me a stars-only image. That way, I can apply sharpening to the nebula without messing up stars, and I can apply Morphological Transformation to the stars without affecting the background. When I am done fiddling, I use PixelMath to add them back together again.
DSO AP:Orion 200mm f/4 Newtonian Astrograph; ATIK 383L+; EFW2 filter wheel; Astrodon Ha,Oiii,LRGB filters; KWIQ/QHY5 guide scope; Planetary AP:Celestron C-11; ZWO ASI120MC; Portable: Celestron C-8 on HEQ5 pro; C-90 on wedge; 20x80 binos; Etc: Canon 350D; Various EPs, etc. Obs: 8' Exploradome; iOptron CEM60 (pier); Helena Observatory (H2O)Astrobin
UlteriorModem wrote: ↑Sat Jan 18, 2020 7:47 pm
Hey Kathy, What formula do you use to remove the 'background' from the original? I tried -Bacground but ended up with a null image.
PixelMath uses the image names. Let's say my stretched image is called "Stretched". I will clone it, producing "Stretched_clone", which, for clarity, I will rename to "Starless". I then apply Starnet to "Starless" so it actually becomes starless.
In PixelMath, I will use the expression "Stretched-Starless", using the names of the relevant images. I have PixelMath create a new image with the results, which I rename "Stars_only". After doing whatever processing I want on the two images, I do a new PixelMath operation, using the expression "Starless+Stars_only". Done.
Note that you use image names, not file names in the PixelMath expression. Image names cannot contain any punctuation except the underscore character, "_".
DSO AP:Orion 200mm f/4 Newtonian Astrograph; ATIK 383L+; EFW2 filter wheel; Astrodon Ha,Oiii,LRGB filters; KWIQ/QHY5 guide scope; Planetary AP:Celestron C-11; ZWO ASI120MC; Portable: Celestron C-8 on HEQ5 pro; C-90 on wedge; 20x80 binos; Etc: Canon 350D; Various EPs, etc. Obs: 8' Exploradome; iOptron CEM60 (pier); Helena Observatory (H2O)Astrobin
UlteriorModem wrote: ↑Sat Jan 18, 2020 9:03 pm
It would seem the underscore is 'mandatory' because if you use spaces the pixel math doesn't know what to do.
Not just PixelMath. PixInsight in general will not allow spaces in image names.
DSO AP:Orion 200mm f/4 Newtonian Astrograph; ATIK 383L+; EFW2 filter wheel; Astrodon Ha,Oiii,LRGB filters; KWIQ/QHY5 guide scope; Planetary AP:Celestron C-11; ZWO ASI120MC; Portable: Celestron C-8 on HEQ5 pro; C-90 on wedge; 20x80 binos; Etc: Canon 350D; Various EPs, etc. Obs: 8' Exploradome; iOptron CEM60 (pier); Helena Observatory (H2O)Astrobin
yobbo89 wrote: ↑Sun Jan 19, 2020 2:26 pm
I don't know what results you are looking for tom,i see you're trying a different technique.
i ran that image with starnet of yours.
Hrm I guess I did not make it clear. That image was after stripping out the stars, processing the nebula, then recombining the stars at 65%. A finished results if you will.