PIXINSIGHT Process Tutorial: Subframe Selector

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PIXINSIGHT Processes A-Z - A dedicated tutorial video for every PI process! In this tutorial we look at the Subframe Selector process - what it does and how to most effectively utilise it.
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#astrophotography #pixinsight #tutorial
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PIXINSIGHT Processes A-Z Video Directory:
ACDNR: • PIXINSIGHT Process Tut...
APASS: • PIXINSIGHT Process Tut...
Atrous Wavelet Transform: • PIXINSIGHT Process Tut...
Adaptive Stretch: • PIXINSIGHT Process Tut...
Annotation: • PIXINSIGHT Process Tut...
ArcSinh Stretch: • PIXINSIGHT Process Tut...
Assign ICC Profile: • PIXINSIGHT Process Tut...
Assisted Color Calibration: • PIXINSIGHT Process Tut...
Auto Histogram: • PIXINSIGHT Process Tut...
ABE (Automatic Background Extractor): • PIXINSIGHT Process Tut...
Background Neutralization: • PIXINSIGHT Process Tut...
Binarize: • PIXINSIGHT Process Tut...
Blink: • PIXINSIGHT Process Tut...
BlurXTerminator: • PIXINSIGHT Process Tut...
Channel Extraction & Combination: • PIXINSIGHT Process Tut...
Channel Match: • PIXINSIGHT Process Tut...
Clone Stamp: • PIXINSIGHT Process Tut...
Color Calibration: • PIXINSIGHT Process Tut...
Color Saturation: • PIXINSIGHT Process Tut...
DBE (Dynamic Background Extraction): • PIXINSIGHT Process Tut...
Exponential Transformation: • PIXINSIGHT Process Tut...
Finding Chart: • PIXINSIGHT Process Tut...
Gaia: • PIXINSIGHT Process Tut...
Linear Fit: • PIXINSIGHT Process Tut...
Local Histogram Equalization: • PIXINSIGHT Process Tut...
Multiscale Linear Transform: • PIXINSIGHT Process Tut...
Photometric Color Calibration: • PIXINSIGHT Process Tut...
Spectrophotometric Color Calibration (SPCC): • New PIXINSIGHT Tool Re...
Statistics: • PIXINSIGHT Process Tut...
Subframe Selector: • PIXINSIGHT Process Tut...
more to come soon.......
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Music credits:
ORBITAL_StriKe by B E T T O G H | / bettogh
bettogh.bandcamp.com | open.spotify.com/artist/3zDlq...
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Creative Commons Attribution 3.0 Unported License
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Опубликовано:

19 июл 2024

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Комментарии : 11

@dadwhitsett Год назад

thanks for this. i admit to being worse than cuiv as i am super-lazy. i use dss [deep sky stacker, freeware] to "grade" my images under register which sorts them by "score". I believe the score is determined by star roundness and size [not well described]. HOWEVER< it effectively shows me quickly which images are super-bad. then while in DSS I delete those images from my hard drive. I then go to PI and place into blink, review them to reassure myself, then place into WBPP. I love PI but the inability to quickly delete super-bad frames is a bit disappointing,unless I am missing something. love your content, btw.

@ScottyP5947 11 месяцев назад

Great! Thank you.

@Canov73 Год назад

Hi Sascha, If you use the Sigma term for the values you dont have to guess. The light gray margins are +2 & -2 Sigma, the dark gray margins are +1 & -1 Sigma and the black line in the middle is 0 Sigma. As an example of the approval i use that also includes the weighting used by WBPP, please see below. StarsSigma > -2 && FWHMSigma < 2 && PSFSNRSigma < 2 && PSFSignalWeightSigma < 2 I hope this is helpful. Cheers, Canov

@viewintospace Год назад

Thanks - great input!!!!!

@gordonahooper Год назад

Thanks Sascha. I agree that SS is an essential process to weed our bad frames that other processes like WBPP won’t see. Nice demonstration. I also add these cross checks to my routine … Stars can also detect the odd frame when there has been a “stutter” in the the guiding producing double stars. Sometimes I miss these in blink. Checking for overly eccentric stars. Checking for excessively high medians with high SNR - these are usually great quality pics of faint high level clouds😊. Creating a weighted score for the best blend of FWHM and eccentricity-from this I select my reference frame for registration. I figure that the tightest and roundest stars make for the best registration reference. I then also note the best PSF signal ratio frame to use as the reference frame for stacking-I like the NSG script for this especially when stacking multiple nights In gradient skies, which is is mostly the case. I also find the SS discipline often provides interesting and Beneficial insights to take back to the night skies. Best, Gordon PS. Many disagree with me and simply stick everything into WBPP.

@viewintospace Год назад

Great input Gordon, thanks! I completely agree with you that dubbing anything just into WBPP is suboptimal and I think I can also show why in this video. But where you perhaps should reconsider your strategy is with the eccentricity.... After my Blink video I had the honour of getting feedback from Adam Block. He mentioned that egg shaped stars should not be removed, as WBPP will correct that (assuming the majority of the pictures has round stars). Based on that, the egg-shaped stars will do no harm but your S/N ratio will benefit from leaving them included.

@gordonahooper Год назад

Excellent feedback, and a good tip. I will use that. Thank you.

@karltheberge3652 Год назад

I tend to diseagree with you about not calibrating before using SS since it tend to pick most hot pixel as stars and screw some important data like Eccentricity.

@viewintospace Год назад

a) As hot pixels are equal throughout all pics to stack they will not influence the eccentricity delta in-between the pics b) Eccentricity should not be an elimination criteria according to Adam Block as it is levelled out throughout stacking c) Thanks to BlurXTerminator Eccentricity is not an issue at all anymore - guess yourself if I'm joking or not... ;-) d) Even if you could prove me wrong with a, b, and c - I would still not interrupt my stacking process - there are certain things which deviate too much from the effort I'm willing to dedicate to processing.... ;-)