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Messages - John_Gill

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1
General / Re: Stacking images from different sessions.
« on: 2019 July 08 05:50:57 »
Hi,

From my understanding this can be done easily.  I would process each stack of images to the point before doing a StarAlignment.  ie, Calibrated, CosmeticCorrection, Debayer (if required), SubframeSelector.  Your image stacks are now "clean".  Now use StarAlignment to combine all clean image stacks.  Finish with maybe LocalNormalization(optional) and finalize with ImageIntegration and DrizzleIntegration (optional).

space is not black
John

2
General / Re: Where to begin?
« on: 2019 July 01 04:40:33 »
Hi,

You can try www.lightvortexastronomy.com or if you drop me a mail at John.Gill013@gmail.com I will send you a text file with a DSLR/OSC workflow and some "starter" settings.  This is not a "cook-book" but a guide to get you started.

space is not black
John

3
General / Re: DSLR PI Process Flow for Dithering?
« on: 2019 June 05 01:16:12 »
Hi,

Dithering is the processing of moving the scope a couple of pixels (in random directions) in-between capturing each image. 
To implement Drizzle you need to check the box when doing a StarAlignment, and when doing a ImageIntegration add the Drizzle file (and the L.Normalization files).  After the ImageIntegration then close all images and do a DrizzleIntegration with the Drizzle and LocalNormalization files.

space is not black
John

4
General / Re: New version installation
« on: 2019 June 03 06:35:11 »
mmmh, perhaps try the following (but I don't think it will work)

try installing an older version of PI and then uninstall it.  This might clear out the problem.

Is there any error message that appears when doing the normal installation?

John

5
General / Re: New version installation
« on: 2019 June 02 10:50:25 »
Hi,

My guess is that you are using a Windows PC. If so, go to the "Control Panel" and the "Program and Features" scroll thru the list and see if PixInsight is listed.  If so, select it, right-click and un-install.  You should "reboot" the pc to get a fresh new start before re-installing PixInsight.

If PixInsight is not listed then you might need to run some other software to clean up the "Registry" and remove old files etc.  I have used a program called "Revo" to do this.

John


6
General / Re: quick local normalization question......
« on: 2019 May 24 02:16:40 »
Hi,

My logic is something like this: Over 5 separate imaging nights of 20 images per night, if you pre-process each nights images up to and including "ImageIntegration" you end-up with 5 images that you register against each other to create a final image.  If you collect all the images up to the "clean" section and then do a "SubframeSelector", "StarAlignment" and "LocalNormalization" you will then do an "ImageIntegration" with 100 images.

With "SubframeSelector" I look for the lowest "Eccentricity" and "FWHM" and highest "SNR" and then make a decision.  Some people use "complex formulas" to weight each image

space is not black
John

7
General / Re: quick local normalization question......
« on: 2019 May 23 05:22:06 »
Hi,

With my workflow I do the following for each session:
Image Calibration
Cosmetic Correction
Debayer (if using OSC)

 *** All Images for each session are now clean ***

Star Alignment all images from each session
Local Normalization for all images
Image Integration for everything.

I hope this helps
John

8
Hi,

Try these setting in StarAlignment:
Star Matching
   RANSAC Tolerance 6.00 - 8.00
   RANSAC Iterations 3000
Star Detection
   Log (Sensitivity) -2.00
   Detection Scales 6 or 7

Hope this helps.

John

9
General / Re: New Method for Star De-Emphasis by Adam Block
« on: 2019 April 25 00:44:21 »
Hey Adam,

Great tutorial!!

Thanks

10
General / Script Editor
« on: 2019 April 11 05:20:03 »
Hi,

I use the "Script Editor" as my recipe notepad when processing.  Is there anyway to re-size the window as it seems to have a "hard" limit to the minimum size.  (A bit like the "Processing Console" window).

space is not black
John

11
General / Re: Windows 8.1 and PixInsight Incompatibility
« on: 2019 March 21 23:19:53 »
Hi,

I would go for Windows 10 Pro.  The "home" edition is a little watered-down and not sure about the Windows 10 S version.  The "QtWidgets" error is related to Apple Quick-time.

Look up
John

12
General / Re: Cannot apply mask to image
« on: 2019 March 18 02:52:39 »
Thanks GJL,

I knew I must have clicked where I should not have clicked ….

13
General / Cannot apply mask to image
« on: 2019 March 18 01:51:59 »
Hi,

I was re-processing an old image and got to the final stages and wanted to apply a star_mask to the image.  So I drag and drop the star_mask to the image, but the image "tag" does not turn brown indicating that a mask is applied.  mmmh, so I tried to apply the mask a little more carefully and I see the "small square icon" appear and drop the mask, but the mask is still not applied.  I created another star_mask, a luminance mask and a range mask and try to apply any of these masks but nothing works.  I saved the project and restarted PixInsight but the same issue persists.  If I look at "History Explorer", I can see that no mask has been applied to the image.  I then created a clone of the image and I can apply any mask to the clone image.

Anyway, I have completed the processing, so not a major problem, but if someone has an idea of what went wrong ……

space is not black
John

14
General / Re: "Pure RAW" or "Demosaiced RGB"?
« on: 2019 March 11 02:12:24 »
Hi,

I would use "Pure RAW" and then do the Debayer a bit later in the work-flow.

space is not black
John

15
General / Re: SFS: Subs taken through cloud vs clear, dark sky?
« on: 2019 February 28 07:17:26 »
Hi,

I have had subs that have had similar SNR, Eccentricity, FWHM, etc. etc. Except one sub that has a large spike in the SNR.  When looking carefully at that sub I found that it was "brighter" because of thin cloud hence the SNR spike. Perhaps the seeing conditions and the clouds even things out.  ;)

space is not black
John


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