Manually stack Seestar sub-exposures in Siril

so this is a short tutorial on how to stack sear images in serial 1.2 firstly you need to have transferred your sub exposures from your C style what you'll end up with is a JPEG image showing the the Stacked image from sear you'll have the Stacked fit file and then in a another folder you'll have a whole series of subexposures in my case I've got 600 of them and they're in a folder that's appended with minus sub so the first thing to do in seral you set our home folder and I generally set up a completely separate folder from where the SE star Subs are saved on a and then I've got it in a folder called sear and then for the tutorial I have a tutorials Inc 281 and I create a folder in there called process and I make that the home folder so what now going to do is convert our C style subexposures into a Serial sequence so we click on the plus we go to where those subexposures are saved which in this case is NGC 281 and in there you'll see there's a folder called Eno andw on sub and in there you select control a to select all of them and add and that's added the list of all of those lights into our list to be converted down the bottom we select debayer and give the sequence a name typically light and click on convert now all this is doing is taking the original fits files it's Dearing them I is taking the color data out of the single image so you'll see it goes through and it converts 600 odd subexposures into a format for serial you can look at those and see a bit more detail if you slate Auto stretch and unlink and these are our 600 sub exposures next thing we need to do is register these if you click on the sequence tab you'll see it's selected the light do sequence sequence if we go to registration and I keep all the default settings as they are and click on go register now what this does it selects lots of stars that it's now going to align each image to uh and as it goes through that it reads all the 600 files and now that's just about finished so that's now aligned all of the images you can see this final image shows the field rotation the next thing I like to do which is probably the most important step click on the plot Tab and you'll notice that this is showing the sort of the quality of each image and you'll see I've got some that have got a very bad quality figure a high number means bad quality um so what I like to do is go through and remove those from the sequence so down at the bottom here there's a box to show the list of all the images so we'll make that a bit bigger bigger and I like to sort this list by fwhm cuz that thing shows in general the best images at the top and then as we go down the worse images if I go all the way to the [Music] bottom this is where we start seeing bad images and if we go through there's a particularly bad image and another bad image there so it's up to you you you you pick what you believe a bad images and you can use the space bar to deselect them and I'll deselect all these particularly bad images and I'll keep the rest in theory you should go through all of them there's another bad one for example and look for bad sub exposures there's another that's got a all the stars have been doubled on that image obviously there was a bit of wind that blew the telescope so I say you can go through pick as many as you like depends how thorough you want to be I'm not going to do all 600 here now so we've now excluded the images that we don't want to include and we now go to the stacking tab on here I use average stacking with rejection additive with scaling and I select output normalization and RGB Equalization and start stacking this will read all the sequences that we haven't all the sub exposures that we haven't excluded from our sequence and we'll now align those stars and stack the images on top of each other to generate as as good a signal to noise ratio as is possible it's now doing the stacking you'll see the progress bar going along the bottom and there's our final stacked image which looks pretty good that's been saved as our light stacked now now that we've done the stacking I like to change the home directory and come out of the process directory and just use the basic NGC 281 directory and then I can then save stack image in here and I will call it angc 281 and that's now saved for us to work on final thing I like to do image information image plate solver because serial ends up Mak an image upside down typically so we run plate solver and this will check the alignment and you'll see it actually flips the image and that's our image ready for postprocessing we'll save that and that's the end of this tutorial

Channel: Chris Gray

Views: 2,579

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Id: 8iL2bzewBrQ

Length: 7min 5sec (425 seconds)

Published: Tue Nov 07 2023