Somewhat new to Siril and I follow Deep Space Astro. Am trying to get rid of elongated stars using his script but won’t run. It starts then kicks me out of SIRIL. Tried it with my Starmask_result.fit from Starnet and with result.fit as well. When I go the long route by running Dynamic PSF. It runs but I have issues with the stars. They are slightly larger and all white when I go into the Autostretch mode from Linear. They’re all round though. When I use Full Resynthesis I get an area in the center of the image where the stars are almost missing. As shown in the below image 1. First image is running Dynamic PSF. Second image is Full Resynthesis.
Don’t worry about the stars looking bloated and white in autostretch preview mode, that’s just an artefact of the autostretch preview. You can get a slightly more representative view of how they will look in Logarithm preview mode. When you recombine them with your starless image they will look fine.
To help me investigate what’s going on, would you be able to send me a link to your original stacked (but not star removed) image so I can take a closer look? Also, can you tell me what star detection options you had set in the DynamicPSF window? (Gaussian / Moffat, amplitude range, convergence etc.)
Thanks,
Adrian.
Thanks for the quick response. Sorry for the delay in getting back to you but I have been experimenting in SIRIL most of the day. I created a second folder with Tiff files that were created from processed raw files in Camera Raw. Both Lights and Darks. I am finding that using the Tiff files vs. RAW files I maintain some color in the stars. Using the RAW files all the stars are white and I cannot get any color back in them. I took the starmask and starless file from Starnet, saved as TIFF and put them back into photoshop. Increasing saturation in photoshop still gave me no color at all. I did as you said to use Logarithm and it looks fine. Asihn also looks good too. I tried both Moffat and Gaussian. Moffat seemed to find more stars than Gaussian. Using Gaussian is where the center of the image had that wide black area in the center. On the dynamic PSF box I only changed from Moffat to Gaussian. I changed nothing else when processing my starmask_result.fit.
I am starting to find that this application has a mind of it’s own. Not sure what I’m doing but I must be hitting something to cause the right side Console box to close. Other than the stars being totally white everything seems fine now. I’m not running a one-click script any longer and processing via the Star Processing menu works.
I probably picked one of the worst shots to play with. As you know the Orion Constellation area has lots of nebula, clouds and tons of stars. Full Resynthesis mode it was processing over 16,000 stars. Let me know if you have any suggestions regarding the color loss in the stars using RAW files or if you need more info…
To get nice colors in the stars use the Generalized Hyperbolic Stretch tool and choose Human Weighted Luminance. It makes a massive difference and your stars will become very colorful.
Thanks for this info Indysbike… I watched a video on this last night from Deep Space Astro. I will work on it today…
Thanks for whoever replied to this initial post of mine. I think I have wasted enough time trying to process my Orion image in SIRIL. Another issue has appeared when I want to move from one directory file to another for processing. I can open a file in another directory but at the top of the SIRIL application box it’s still pointing to the directory I was using. Have searched at the SIRIL site and on this site found nothing on changing the working directory to another directory. 30 Years in Silicon Valley in IT for the top companies and SIRIL has finally made me want to destroy all my computers. Again thanks to those who responded to my other two posts.
Siril works from what it calls a “home directory”. It’s essentially a working directory: if you’re working with sequences, for example, the output of a sequence operation will be saved in the home directory. You can change the home directory by clicking the Home button (house icon) in the top bar next to the Open button and quick access dropdown. You can open files from anywhere in your filesystem, and if you “Save” they will just be saved in place where they are, but if you “Save as” the save dialog will open showing you the home directory.