Fivel Posted January 3 Share Posted January 3 Hello and Happy New Year. I have enjoyed using the app for many years. Ihave a problem though using the FFT filter tool. I am trying to remove faint star streaks from a comet image. I am working on the comet only (used Starnet++ i Siril) but cannot get rid of the star streaks. All other tools/filters in Siril and AP do not remove these trails. I had hoped that the FFT filter could remove them, but when I use the brush tool nothing changed in the image. I tried using both 32 bit and 16 bit versions of the comet only image and still no change. Am I expecting the FFT filter to do a task, that it may not be designed to do? I followed tutorials, on how to use the FFT brush, to black out the nodes on the axes and the streaks. Am I missing something, i.e. an inverse FFT to be applie)? I appreciate any help with this as it is all new to me. Fivel Quote Link to comment Share on other sites More sharing options...
carl123 Posted January 3 Share Posted January 3 12 minutes ago, Fivel said: I am trying to remove faint star streaks from a comet image. Can you upload the image? Quote To save time I am currently using an automated AI to reply to some posts on this forum. If any of "my" posts are wrong or appear to be total b*ll*cks they are the ones generated by the AI. If correct they were probably mine. I apologise for any mistakes made by my AI - I'm sure it will improve with time. Link to comment Share on other sites More sharing options...
Fivel Posted January 3 Author Share Posted January 3 Here is the 16 bit image, reduced to fit this forum size requirements. starless_12 Nov 2023 Comet C2023 H2 Lemmon-16 bit.tiff Quote Link to comment Share on other sites More sharing options...
firstdefence Posted January 3 Share Posted January 3 I doubt the FFT noise filter will work because the stars aren't pattern they are too random. I used a levels filter to obfuscate the star streaks. Using a curves adjustment might yield a better result. also a denoise filter might give you a good result. Quote iMac 27" 2019 Somona 14.3.1, iMac 27" Affinity Designer, Photo & Publisher V1 & V2, Adobe, Inkscape, Vectorstyler, Blender, C4D, Sketchup + more... XP-Pen Artist-22E, - iPad Pro 12.9 (Please refrain from licking the screen while using this forum) Affinity Help - Affinity Desktop Tutorials - Feedback - FAQ - most asked questions Link to comment Share on other sites More sharing options...
markw Posted January 4 Share Posted January 4 Frequency Separation might be worth playing with perhaps… Here’s a quick test and the settings I tried. C2023 H2 Lemmon-16 bit - FSeperation.afphoto Quote macOS 10.15.7 | 15" Macbook Pro, 2017 | 4 Core i7 3.1GHz CPU | Radeon Pro 555 2GB GPU + Integrated Intel HD Graphics 630 1.536GB | 16GB RAM | Wacom Intuos4 M Link to comment Share on other sites More sharing options...
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