Show Posts

This section allows you to view all posts made by this member. Note that you can only see posts made in areas you currently have access to.


Messages - RickS

Pages: [1] 2 3 ... 84
1
I'll upload a few to Dropbox tonight and send you a link...

2
Hi Juan,

I have some test subs at fairly short focal length (image scale a few arcsec/pixel) with Saturn near M8/M20.  Are they useful?

Cheers,
Rick.

3
Announcements / Re: Price
« on: 2019 March 18 21:54:47 »
IMO, the price for PixInsight is more than fair and I'm certain that it's not making Juan rich. That being the case, why should he ever offer it for a cheaper price?  You're entitled to your own opinion but I don't think there are many that would share it.

Cheers,
Rick.

4
General / Re: Can't open new preview window
« on: 2019 March 17 14:37:12 »
You won't be able to create a new preview in a window where "Show Previews" is disabled.  That's most likely the problem.

5
General / Re: Integrating multiple sessions of images
« on: 2019 March 14 20:03:50 »
It's not a good idea to use BPP for the integration anyway.  Do multiple BPP runs, one for each night (or temp range or whatever you prefer) but with the same reference image for all of them.  Then combine the calibrated and registered results of all the nights in one integration.  It will take some tweaking of the rejection parameters to get best SNR (reduce rejection to the minimum needed.)  This optimisation of the SNR is why we don't rely on BPP to do integration.

Cheers,
Rick.

6
General / Re: Best subframe to select using SubframeSelector
« on: 2019 March 14 02:49:34 »
Lowest FWHM / Eccentricity for Star Alignment (BPP) but then highest S/N for Image Integration.

For integration I look for a reference that looks clean wrt gradients from high clouds, etc. rather than best (estimated) SNR.

7
General / Re: Best subframe to select using SubframeSelector
« on: 2019 March 13 18:38:58 »
For the BPP registration reference I look for small, round stars: low FWHM combined with low Eccentricity.

8
General / Re: Improving PI speed
« on: 2019 March 11 20:55:26 »
I noticed something similar, Joel.  Linux was generally quite a lot faster than Windows but (with at least one set of data) StarAlignment with distortion correction was much slower.  I meant to dig a bit further and see if I could figure out what was going on but never got to it.

Are you saying that this was isolated to StarAlignment and that other scripts ran faster on Linux than on Windows?  I think I'll run another speed test with CosmeticCorrection and see how each performs.

I just noticed that most things were faster on Linux but StarAlignment, specifically with distortion correction, was a lot slower on Linux compared to Windows on my test data sets.  I wasn't running scripts.  I was playing around with my own data.

9
General / Re: Improving PI speed
« on: 2019 March 10 20:24:17 »
I noticed something similar, Joel.  Linux was generally quite a lot faster than Windows but (with at least one set of data) StarAlignment with distortion correction was much slower.  I meant to dig a bit further and see if I could figure out what was going on but never got to it.

10
Load the calibration files and lights into BatchPreprocessing to get the calibration and registration done.  Then create a master for each filter with ImageIntegration adjusting the rejection parameters carefully to maximize SNR (keep the amount of rejection as small as you can while still getting rid of anything you don't want.)  For RGB data you can combine the colours now and process as you would have done with the OSC data from your 450d.  For advice on narrowband you'll find many threads on this forum or check out some of the tutorials and other resources that are available.

Cheers,
Rick.

11
I think you might need to be a bit more specific about what you have tried and what sort of help you need.

12
Hi Kevin,

I have seen some quite significant improvements in FWHM from SFS weighting but I normally use quite an aggressive formula:

80*(1/(FWHM*FWHM)-1/(FWHMMax*FWHMMax))/(1/(FWHMMin*FWHMMin)-1/(FWHMMax*FWHMMax))
      +15*((SNRWeight-SNRWeightMin)/(SNRWeightMax-SNRWeightMin))
      +5*(1-(Eccentricity-EccentricityMin)/(EccentricityMax-EccentricityMin))

Cheers,
Rick.

13
I don't know that you can hold PI responsible for the foibles of your sensor :)  For sensors with bad amp glow it is usually best to use darks of exactly the same duration as your lights and you may need to disable dark optimization as well.

Cheers,
Rick.

14
General / Re: Pixel Math If (Case or Switch statement)
« on: 2019 February 20 16:49:21 »
There's always the option of nesting your iif expressions, Adam.  It can get unwieldy and you need to be careful matching the parentheses, but it might be easier than learning JavaScript.

iif(x()==0, 0.020749760758206493, iif(x()==1, 0.02083269071095121, iif(x()==2, 0.020591074008640423, ...

Cheers,
Rick.

15
Are you sure it's the .xdrz files that can't be found?  The .xdrz files reference the original data files prior to registration.  If you have deleted these files then you will get errors.

Cheers,
Rick.

Pages: [1] 2 3 ... 84