Search found 3367 matches

by admin
Mon Mar 25, 2024 12:23 am
Forum: Image Processing Troubleshooting
Topic: Donut stars
Replies: 41
Views: 826

Re: Donut stars

I'm definitely not proposing we should be doing 16-bit stacking, however the assumption is that the source material is *multiple subs* of 10, 12, 14 or 16-bit quantized data, where values fell within the range of 0 to /1024, 4096, 16384 or 65536. Stacking multiple subs will - in essence - add 2^(sta...
by admin
Sun Mar 24, 2024 12:39 am
Forum: Image Processing Troubleshooting
Topic: Donut stars
Replies: 41
Views: 826

Re: Donut stars

Links to download M3 stack https://www.dropbox.com/scl/fi/19k8e7fvq4l1jsj7zxvhi/M3_220x45s_GESDT-default_rgb.fit?rlkey=dv1uk4qakasttfxnukga5hwi4&dl=0 Single sub https://www.dropbox.com/scl/fi/yp36jy170m8q9yywy0346/M3_test_single_sub_336.fit?rlkey=w5jepx5ajz6jj3oeqh2nmieja&dl=0 Thank you for uploadi...
by admin
Sat Mar 23, 2024 11:21 am
Forum: Image Processing Troubleshooting
Topic: Donut stars
Replies: 41
Views: 826

Re: Donut stars

The plateauing can be caused by a number of things and would - as already mentioned - be chiefly caused by an area that shows comparatively very little change in co-located pixels (as a proxy for "detail"). It would therefore receive a smaller dynamic range allocation. I've seen this happen as a res...
by admin
Sun Feb 11, 2024 1:08 am
Forum: General Discussion
Topic: RC BlurXterminator …. Any comments ?
Replies: 36
Views: 59804

Re: RC BlurXterminator …. Any comments ?

@Mike in Rancho have you read Shaun's Experienced Imaging thread about his "convolve then deconvolve" experiment? There was discussion from Rista about noise profiles (I guess so, because you thought Shaun's new thread was about the M101 data). Anyway, I expect you're right that applying SVD to the...
by admin
Thu Feb 08, 2024 1:15 am
Forum: General Discussion
Topic: Astro to Astro-art Continuum, 2024 Edition
Replies: 45
Views: 6908

Re: Astro to Astro-art Continuum, 2024 Edition

This is brilliant Dietmar - I love seeing people dive deep into what's happening (and taking others along for the ride). :bow-yellow:
by admin
Sun Feb 04, 2024 11:41 pm
Forum: General Discussion
Topic: Astro to Astro-art Continuum, 2024 Edition
Replies: 45
Views: 6908

Re: Astro to Astro-art Continuum, 2024 Edition

Hi Ivo, thank you for these additional comments, and for 'translating' them into their audio equivalents. I wonder if the audio analogy has it's limit when we look at the default settings of the scale sliders. By default, details of all scales are sharpened (100%). In terms of audio we would push u...
by admin
Sat Feb 03, 2024 5:46 am
Forum: General Discussion
Topic: Astro to Astro-art Continuum, 2024 Edition
Replies: 45
Views: 6908

Re: Astro to Astro-art Continuum, 2024 Edition

Wavelet Sharpening in StarTools is indeed "more" data driven than a regular wavelet sharpener, in that it uses more statistics and analysis of the data to achieve two - for AP generally - desirable things; it refrains from boosting areas that don't have enough signal (uses Tracking's signal evolutio...
by admin
Fri Feb 02, 2024 2:33 am
Forum: General Discussion
Topic: Astro to Astro-art Continuum, 2024 Edition
Replies: 45
Views: 6908

Re: Astro to Astro-art Continuum, 2024 Edition

If it helps, almost every processing algorithm/technique has an equivalent in "1D" such as in audio/music; For example; Wavelet sharpening is about isolating and manipulating specific frequencies (like a graphic equalizer). Deconvolution can be thought of as undoing the effects of a reverb/reflectio...
by admin
Wed Nov 15, 2023 5:13 am
Forum: General Discussion
Topic: StarTools 1.9 Beta
Replies: 67
Views: 693817

Re: StarTools 1.9 Beta

Small update again (1.9.561 beta 5). Chasing some odd bug that passes file dialog clicks onto StarTools on some OSs. For any macOS folks running Ventura and later (e.g. hixx ?), I also added a new way of unquarantining that I'd like to roll out if it works reliably; control + click on StarTools.app....
by admin
Mon Nov 06, 2023 4:06 am
Forum: Feature Requests
Topic: Sky Glow parameter in FilmDev
Replies: 4
Views: 25082

Re: Sky Glow parameter in FilmDev

Hi Jeff, Thank you for your post. What you appear to be suggesting would constitute data clipping/destroying (e.g. throwing away pixels below a certain threshold). This is almost never OK, except in cases where that data can be assumed to be anomalous. For this purpose you will already find a "Dark ...