I felt a great disturbance in the Force, as if millions of subframes suddenly cried out in terror and were suddenly rejected. Great topic for a video. I learned something new! I'm already grading my subframes--for the first time beyond using Blink. Thank you.
I did a search for Subframe Selector and your video came up :-). This is very useful as I am currently doing some lucky DSO imaging and need better star Eccentricity but don't want to manually blink through hundreds of images. Thanks for the video!
I use SFS and I get more and more selective as I acquire more data. For example, I might start off with FWHM < 6 and Eccentricity < 0.7... but tighten it up to FWHM < 4 and Eccentricity < 0.4 once I've got a few nights worth of data. Also, I put in my actual values. Easy enough to get from the FITS header. My process is basically use WBPP to do the calibration and weighting. Then bring the calibrated frames into SFS and determine what I want to keep. Then, I register the keepers and integrate them.
Yeah that makes sense to get more selective with more data. I have done it both ways with WBPP calibration/weighting first or second and didn't see too much difference but definitely for multiple nights it might be the more efficient workflow to do it the way you describe. Thanks for sharing! 😎
I was wondering how this was done. Love these PixInsight from you. simple, make sense, and allow me to dive in without inundating me with excess info. thanks for another good video! Still working on my 16 pane mosaic, lots of work but looks good so far. Cheers! PS, I look through my frames and take out the obvious. In DSS I was more selective. I'll try this in PI!
Thanks, Victoria! Glad you like the videos; it is a good challenge to limit video topics (and allows for more videos to be made!) so I am glad the format is useful!
Thanks, Joe! Haha yeah I was trying that word out for search engine reasons but this is something I didn't even think about as a beginner. Maybe expert beginners... 😆
@@WindyCityAstrophotography just ran my images from Monday through SubFrameSelector, an then opened one that not great and another that good, side by side can definitely see slight differences, thank you once again 👍🏼👍🏼😊
Nice presentation! The Subframe scale can be found by using Stellarium or Astronomy.tools and configuring in your camera and telescope, or using the formula Arcseconds/Pixel = (206.2648 * (Camera_Pixel_Size_in_μm) / (Telescope_Focal_Length_in_mm). And the Camera Gain can be found in the FITS headers of your Lights by opening one in PixInsight and selecting "FITS Header" from the "File" menu.
Thanks, Jason! At some point I'll do a video on this process for configuring it for actual values rather than relative. I had configured it on previous computer at one point but hadn't gotten to it on the new rig 😆
I'm still curious to see how picky you actually need to be as I just did a rough stack with lots of errors/clouds/ elongated stars. While it was not as sharp as I'm hoping for the stars were all round and it wasn't awful. I just captured 59 hours of data, I'm thinking of doing a stack with everything as is and then a very picky selection taking out the slightest errors to compare the two if I don't find a good answer to that before hand.
I'm just now getting to the point where I want to do this sort of thing. I'm using APP for my stacking. Do you, or anyone else, know of a way to sort and select subs by certain properties using APP? Thanks!
Yes, I rely on the Weighted Batch PreProcessing script to take care of weighting my approved subframes. I could definitely do the weighting in Subframe Selector but it is so much easier to use the Nebula/Galaxy/Cluster weighting presets and then adjust the parameters from there vs manipulating the weighting equation. Gotta pick my battles for complication 😆
