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Messages - John_Gill

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1
Off-topic / Crop and process or process and crop ...
« on: 2020 February 21 04:48:16 »
Hi,

Is it better to crop the image and then process or process the image and then crop?

space is not black
John

2
General / Re: Double clicking an XISF file crashes PI
« on: 2020 February 21 04:43:36 »
Hi,

Try this:
On your desktop, point at the .XISF file and right-click and select "Open With" and then select "Choose another app", next select PixInsight and also check the box that says "Always use this app to open .XISF files"

space is not black
John

3
General / Re: Integration problem with CCD narrowband images
« on: 2020 February 21 01:33:57 »
Hi,

Try "Blinking" the images and seeing if the images contain the right data.  If that is all good, then run the ImageCalibration and then "Blink" the results. If still good, then do a Cosmetic Correction and Blink again.... etc etc.

You might be trying to do an ImageIntegration and pointing to a wrong folder or set of files (flats/darks etc.)

space is not black
John

4
Bug Reports / Re: SubFrameSelector Graphs
« on: 2020 February 20 22:42:51 »
About the graphs not displaying, I did a shutdown and restart of the laptop and "Hey Presto" the graphs are back ...  ::)

Oh well...when in doubt, reboot and restart ...

John

5
General / Re: Subframe Selector - What am I looking at?
« on: 2020 February 20 22:39:29 »
Hi,

Remember this is for the SubFrameSelector Process and not the Script.

When you load the SFS, it should open three windows, first - SubFrameSelector window, second - Measurements window and thirdly the Expressions window.  If the second and third window do not open, then in the SubFrameSelector window, click the two buttons in the top right corner (Fx & Graphs) and that should open the "missing" windows.

In the "Expressions" window under Weighting, is where you input the formula:   (15*(1-(FWHM-FWHMMin)/(FWHMMax-FWHMMin)) + 15*(1-(Eccentricity-EccentricityMin)/(EccentricityMax-EccentricityMin)) + 20*(SNRWeight-SNRWeightMin)/(SNRWeightMax-SNRWeightMin))


The "graphs and results" window will allow you to view the results.  When you are happy with your file selection, go back to the main window under "Routine" select "Output Subframes" and in the "Output Files" put in the folder location (I call my folder, "approved") and in the "Keyword" type in SSWEIGHT.

The SSWEIGHT keyword will be embedded into the image and will be used when doing an ImageIntegration and using the keyword SSWEIGHT.

space is not black
John

6
General / Re: Local normalization problem
« on: 2020 February 19 23:28:30 »
Hi,

LocalNormalization is a great tool to equalize images that are statistically different (i.e. images from different nights/equipment/atmospheric differences).
LN can work wonders and can also not contribute to the image.  Personally I have stopped using LN as I found using DBE better at removing gradients/brightness etc.

space is not black
John

7
General / Re: Subframe Selector - What am I looking at?
« on: 2020 February 18 10:00:20 »
Hi,

Here is the formula again, please double check that there are two ) at the end of the formula.

(15*(1-(FWHM-FWHMMin)/(FWHMMax-FWHMMin)) + 15*(1-(Eccentricity-EccentricityMin)/(EccentricityMax-EccentricityMin)) + 20*(SNRWeight-SNRWeightMin)/(SNRWeightMax-SNRWeightMin))

John

8
Bug Reports / Re: SubFrameSelector Graphs
« on: 2020 February 18 06:54:23 »
I think it is just bad data cos the formula works with everything else ... I was just curious.

Any ideas about the graphs?

John

9
Bug Reports / SubFrameSelector Graphs
« on: 2020 February 18 04:52:57 »
Hi,

Running PixInsight 1.8.8.4 Ripley on a Windows 10 version 1909 build18363.657

Just re-processing some older images and SFS crunches all the images and calculates the weighting and all is good, except that the graphs do not display.

The other issue is not a bug, but I suspect bad data.... I add the "bad images" and Measure Subframes and then the Weighting formula has a red X next to it and in the Measurements window the FWHM and ECC show -nan(ind) ..... any ideas as to what is wrong?

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John

10
General / Re: Subframe Selector - What am I looking at?
« on: 2020 February 17 22:05:16 »
No problem.  Copy and paste works great  :smiley:

11
General / Re: Subframe Selector - What am I looking at?
« on: 2020 February 16 22:34:18 »
Hi,

Here is the formula I use:
(15*(1-(FWHM-FWHMMin)/(FWHMMax-FWHMMin)) + 15*(1-(Eccentricity-EccentricityMin)/(EccentricityMax-EccentricityMin)) + 20*(SNRWeight-SNRWeightMin)/(SNRWeightMax-SNRWeightMin))

So I use this formula to "weight" each frame and make a note of the best image name.  In SFS you can then sort on "weight".....Output the frames to an "Approved" folder.  This will write the weighting to the "FITS header" with a name SSWEIGHT.  When doing StarAlignment, use the best frame from SFS.  Then in ImageIntegration under "weights" select "FITS Keyword" and type in SSWEIGHT.
This will create you new image using the highest weighted image contributing the most going down to the least weighted image contributing the least.

space is not black
John
 

12
General / Re: Subframe Selector - What am I looking at?
« on: 2020 February 16 10:09:55 »
Hi,

Basically you want the highest SNR and the lowest Eccentricity and or FWHM. With Ecc and FWHM, scores lower than 0.4 is not detectable by eye. I use a formula to weight each frame, calculating the result based on 50% SNR and 25. % Ecc and 25% FWHM.

space is not not black
John

13
General / Re: am i missing a step/configuration in preprocessing ?
« on: 2020 February 13 05:22:21 »
mmmh, I had a look at the data and I am still a bit puzzled.....anyway, try this...

For each filter set, go thru the following workflow --->
ImageCalibration
* Cosmetic Correction (not required for this test)
* Debayer (only required for Color Images)
* SubFrameSelector (not required for this test)
StarAlignment
ImageIntegration

That should generate a single image for  each RGB channel.
These 3 images should be stretched with ArcsinhStretch/MaskedStretch/HistogramTransformation
This will convert the images from linear to non-linear and then use LRGBcombination.

Put these 3 images in Google Drive and I will have another look ...
Please also post the make and model of your camera.

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John

14
General / Re: am i missing a step/configuration in preprocessing ?
« on: 2020 February 13 01:20:54 »
Hi,

After Calibration, StarAlignment and ImageIntegration you end up with 4 masters of L, R, G, B.  You now need to stretch each master with ArcsinhStretch or MaskedStretch or HistogramTransformation. Then use LRGBChannelCombination to create the LRGB image.

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John

15
Bug Reports / Re: Constant crashes. At my wits end now with PI.
« on: 2020 February 12 22:49:21 »
Hi,

I looked at the video but could not read the PixInsight crash info. Can you capture the "red" text and post that info here.  I saw someone commented in your video that you were running Windows10 in 32bit mode.  Can you confirm this.  Find "Control Panel" ---> "System"  This will give exact Window configuration.  If you are in fact running in 32bit mode, that would explain the crash.

space is not black
John

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