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Topics - sreilly

Pages: [1] 2 3 ... 11
1
General / Calibration Basics
« on: 2019 December 23 11:52:36 »
I came across an issue with my calibration process back a while ago and found that a bad master dark was to blame. This made me rethink my master frame thinking....again. I have downloaded, printed out, and reread the paper on Acquisition and Processing Master Calibration Frames a number of times and thought I had a good handle on it. Let me explain how I usually do this to see where I'm either wrong or right:

I take usually 100-200 bias frames on bad weather days. For my camera I was long ago advised that bias frames were sensitive to temperature on this model so I have always taken my biases at the same temperature which is easy as I always image at -20 and darks by the same temperature as well for the exposure times that I used being 900 and 1800 seconds. So I generally take 20-75 or so darks depending on weather to create my masters.

My flats are taken with a minimum of 16 per filter per side of pier (I use a rotator) meaning I have E/W side filter masters when finished. They do make a difference for me at least.

I calibrate the flats usually by using the settings as seen in the Master Calibration Frames Acquisition and Processing PDF found on the PI sight under Resources https://pixinsight.com/tutorials/master-frames/index.html.

Recently I noticed that my master flats were showing pixel column defects in them which was then noticed on images when calibrated. So I stooped using the Master Bias frame and only now use the Master Dark set to Optimize which eliminated those column defects. My thinking is that since I'm not scaling the darks in my image calibration I shouldn't need the bias frames. So with my process do the instructions in the referenced PDF apply to my method? Do I actually need Master Bias frames at all?

Keep in mind that my flat frame exposures are under 2-6 seconds most for NB filters and just over 1 second for LRGB filters.

2
General / Stretching 43 Comet Images....
« on: 2019 December 08 06:18:26 »
So going back to 2015 I discover some long forgotten images I took of Comet Lovejoy and they have been processed but now that I've found them I want to make a video (avi). I looked at the feature in Blink and it went through the stack but each time it fails to execute an external program to complete. So now I just want to get as far as stretching these frames. I have no issues with the automatic strecth feature used in Blink but is there a way to use this and then save the stretched images. I realize the blink images are just screen stretched but can they or is there a process to strect a batch of like frames at one time versus doing 43 one at a time?

3
General / M76 Narrowband and LRGB Data
« on: 2019 November 21 19:15:07 »
So I've got a ton, well a fair amount, of data on M76 with the following:

16 - 15 minute red
16 -15 minute green
23 -15 minute blue
71 - 15 minute luminance

42 -30 minute Ha
41 -30 minute S2
40 - 30 minute O3

I have followed Karyon's tutorial at https://www.lightvortexastronomy.com/tutorial-narrowband-hubble-palette.html and came up with the S2HaO3 as attached.

The LRGB of M76 is also attached. What I'm curious about is if the data can be combined to show more detail in the nebula. I'm as green as they come with narrowband processing and maybe M76 wasn't a good target but.....any suggestions? I mean this is 61 .5 hours of NB data and 31.5 hours of LRGB. What could be done with 93 hours of total data. Just for the record, these were imaged with an STL-11000 CCD through a 12.5" OGS RC telescope on an AP1200GTO mount.

Suggestions, links to tutorials, anything?

Thanks,

Steve

4
General / Star Alignment Fails
« on: 2019 October 30 13:24:13 »
I've got 110 900 second frames loaded that have been calibrated and cosmetic corrected and when load as usual I get failure of all but the file being used for alignment. These same frames in another program align just fine. I reset the settings in case something got corrupted but no joy. Something is very amiss. Years of using PI has never had this failure. PI is current and has been since it's last update. I closed Pi, reopened and tried again, no joy. I rebooted the system and no joy. I'll try on another computer but this just happened. I ran PI without issue yesterday and successfully aligned over 300 images......I tired a smaller stack and same results message below.


StarAlignment: Global context
Loading reference image:
I:/David_SRO/Filters/ARP273/CC/900/ARP273-20191027@034453-900S-Luminance-PA004-E-T-20_c_cc.xisf
Loading image: w=4096 h=4096 n=1 Gray Float32
154 FITS keyword(s) extracted.
Structure map: done
Detecting stars: done
Fitting 1707 stars: done
503 PSF fits.

Registration of 6 target files.
* Using 6 worker threads.
[000] I:/David_SRO/Filters/ARP273/CC/900/ARP273-20191027@034453-900S-Luminance-PA004-E-T-20_c_cc.xisf
[001] I:/David_SRO/Filters/ARP273/CC/900/ARP273-20191027@040043-900S-Luminance-PA004-E-T-20_c_cc.xisf
[002] I:/David_SRO/Filters/ARP273/CC/900/ARP273-20191027@041637-900S-Luminance-PA004-E-T-20_c_cc.xisf
[003] I:/David_SRO/Filters/ARP273/CC/900/ARP273-20191027@043228-900S-Luminance-PA004-E-T-20_c_cc.xisf
[004] I:/David_SRO/Filters/ARP273/CC/900/ARP273-20191027@045047-900S-Luminance-PA004-E-T-20_c_cc.xisf
[005] I:/David_SRO/Filters/ARP273/CC/900/ARP273-20191027@050641-900S-Luminance-PA004-E-T-20_c_cc.xisf

* Waiting for running tasks to terminate...

Loading target file:
I:/David_SRO/Filters/ARP273/CC/900/ARP273-20191027@041637-900S-Luminance-PA004-E-T-20_c_cc.xisf
Loading image: w=4096 h=4096 n=1 Gray Float32
154 FITS keyword(s) extracted.
Structure map: done
Detecting stars: done
Fitting 1746 stars: done
788 PSF fits.
Matching stars: done
210 putative star pair matches.
Performing RANSAC: done
* Previous attempt failed - this is try #2
useScaleDifferences=true
Matching stars: done
171 putative star pair matches.
Performing RANSAC: done
* Previous attempt failed - this is try #3
useScaleDifferences=false
* Reference image: Limiting to 250 brightest stars.
* Target image: Limiting to 250 brightest stars.
Matching stars: done
86 putative star pair matches.
Performing RANSAC: done
* Previous attempt failed - this is try #4
useScaleDifferences=true
* Reference image: Limiting to 250 brightest stars.
* Target image: Limiting to 250 brightest stars.
Matching stars: done
71 putative star pair matches.
Performing RANSAC: done
* Previous attempt failed - this is try #5
useScaleDifferences=false
* Reference image: Limiting to 125 brightest stars.
* Target image: Limiting to 125 brightest stars.
Matching stars: done
44 putative star pair matches.
Performing RANSAC: done
* Previous attempt failed - this is try #6
useScaleDifferences=true
* Reference image: Limiting to 125 brightest stars.
* Target image: Limiting to 125 brightest stars.
Matching stars: done
41 putative star pair matches.
Performing RANSAC: done
* Previous attempt failed - this is try #7
useScaleDifferences=false
* Reference image: Limiting to 60 brightest stars.
* Target image: Limiting to 60 brightest stars.
Matching stars: done
26 putative star pair matches.
Performing RANSAC: done
* Previous attempt failed - this is try #8
useScaleDifferences=true
* Reference image: Limiting to 60 brightest stars.
* Target image: Limiting to 60 brightest stars.
Matching stars: done
23 putative star pair matches.
Performing RANSAC: done
* Previous attempt failed - this is try #9
useScaleDifferences=false
* Reference image: Limiting to 30 brightest stars.
* Target image: Limiting to 30 brightest stars.
Matching stars: done
17 putative star pair matches.
Performing RANSAC: done
* Previous attempt failed - this is try #10
useScaleDifferences=true
* Reference image: Limiting to 30 brightest stars.
* Target image: Limiting to 30 brightest stars.
Matching stars: done
*** 5 star pair matches found - need at least six matched stars.
* Previous attempt failed - this is try #11
useScaleDifferences=false
* Reference image: Limiting to 15 brightest stars.
* Target image: Limiting to 15 brightest stars.
Matching stars: done
*** 0 star pair matches found - need at least six matched stars.
* Previous attempt failed - this is try #12
useScaleDifferences=true
* Reference image: Limiting to 15 brightest stars.
* Target image: Limiting to 15 brightest stars.
Matching stars: done
*** 0 star pair matches found - need at least six matched stars.
* Previous attempt failed - this is try #13
useScaleDifferences=false
* Reference image: Limiting to 8 brightest stars.
* Target image: Limiting to 8 brightest stars.
Matching stars: done
*** 0 star pair matches found - need at least six matched stars.
* Previous attempt failed - this is try #14
useScaleDifferences=true
* Reference image: Limiting to 8 brightest stars.
* Target image: Limiting to 8 brightest stars.
Matching stars: done
*** 0 star pair matches found - need at least six matched stars.
* Previous attempt failed - this is try #15
useScaleDifferences=false
* Reference image: Limiting to 500 brightest stars.
* Target image: Limiting to 500 brightest stars.
Matching stars: done
170 putative star pair matches.
Performing RANSAC: done
* Previous attempt failed - this is try #16
useScaleDifferences=true
* Reference image: Limiting to 500 brightest stars.
* Target image: Limiting to 500 brightest stars.
Matching stars: done
142 putative star pair matches.
Performing RANSAC: done

*** Error:
*** Error: Unable to find an initial set of putative star pair matches.

* Applying error policy: Continue on error.
Loading target file:
I:/David_SRO/Filters/ARP273/CC/900/ARP273-20191027@034453-900S-Luminance-PA004-E-T-20_c_cc.xisf
Loading image: w=4096 h=4096 n=1 Gray Float32
154 FITS keyword(s) extracted.
Structure map: done
Detecting stars: done
Fitting 1707 stars:
503 PSF fits.
Matching stars: done
503 putative star pair matches.
Performing RANSAC: done
503 star pair matches in 12 RANSAC iterations.
* Summary of model properties:
Inliers       : 1.000
Overlapping   : 1.000
Regularity    : 0.983
Quality       : 0.996
Root mean square error:
delta_RMS     :  0.000 px
RMS error deviation:
sigma_RMS     :  0.000 px
Peak errors:
delta_x_max   :  0.000 px
delta_y_max   :  0.000 px
* Projective transformation matrix:
     +1.000000     -0.000000     +0.000000
     +0.000000     +1.000000     +0.000000
     +0.000000     -0.000000     +1.000000
translation   :      0.00 px
translation_x :     +0.00 px
translation_y :     +0.00 px
rotation      :     +0.00 deg
scale         : 1.000
scale_x       : 1.000
scale_y       : 1.000
Generating registered image
Homographic Projection / Lanczos-3 interpolation, c=0.30: done
Registration successful.
Writing output file: I:/David_SRO/Filters/ARP273/PI/900/ARP273-20191027@034453-900S-Luminance-PA004-E-T-20_c_cc_r.xisf
* File already exists, writing to: I:/David_SRO/Filters/ARP273/PI/900/ARP273-20191027@034453-900S-Luminance-PA004-E-T-20_c_cc_r_3.xisf
Writing image: w=4096 h=4096 n=1 Gray Float32
175 FITS keyword(s) embedded.
6 image properties embedded.

Loading target file:
I:/David_SRO/Filters/ARP273/CC/900/ARP273-20191027@050641-900S-Luminance-PA004-E-T-20_c_cc.xisf
Loading image: w=4096 h=4096 n=1 Gray Float32
154 FITS keyword(s) extracted.
Structure map: done
Detecting stars: done
Fitting 1912 stars: done
839 PSF fits.
Matching stars: done
215 putative star pair matches.
Performing RANSAC: done
* Previous attempt failed - this is try #2
useScaleDifferences=true
Matching stars: done
183 putative star pair matches.
Performing RANSAC: done
* Previous attempt failed - this is try #3
useScaleDifferences=false
* Reference image: Limiting to 250 brightest stars.
* Target image: Limiting to 250 brightest stars.
Matching stars: done
87 putative star pair matches.
Performing RANSAC: done
* Previous attempt failed - this is try #4
useScaleDifferences=true
* Reference image: Limiting to 250 brightest stars.
* Target image: Limiting to 250 brightest stars.
Matching stars: done
68 putative star pair matches.
Performing RANSAC: done
* Previous attempt failed - this is try #5
useScaleDifferences=false
* Reference image: Limiting to 125 brightest stars.
* Target image: Limiting to 125 brightest stars.
Matching stars: done
48 putative star pair matches.
Performing RANSAC: done
* Previous attempt failed - this is try #6
useScaleDifferences=true
* Reference image: Limiting to 125 brightest stars.
* Target image: Limiting to 125 brightest stars.
Matching stars: done
46 putative star pair matches.
Performing RANSAC: done
* Previous attempt failed - this is try #7
useScaleDifferences=false
* Reference image: Limiting to 60 brightest stars.
* Target image: Limiting to 60 brightest stars.
Matching stars: done
23 putative star pair matches.
Performing RANSAC: done
* Previous attempt failed - this is try #8
useScaleDifferences=true
* Reference image: Limiting to 60 brightest stars.
* Target image: Limiting to 60 brightest stars.
Matching stars: done
17 putative star pair matches.
Performing RANSAC: done
* Previous attempt failed - this is try #9
useScaleDifferences=false
* Reference image: Limiting to 30 brightest stars.
* Target image: Limiting to 30 brightest stars.
Matching stars: done
15 putative star pair matches.
Performing RANSAC: done
* Previous attempt failed - this is try #10
useScaleDifferences=true
* Reference image: Limiting to 30 brightest stars.
* Target image: Limiting to 30 brightest stars.
Matching stars: done
*** 5 star pair matches found - need at least six matched stars.
* Previous attempt failed - this is try #11
useScaleDifferences=false
* Reference image: Limiting to 15 brightest stars.
* Target image: Limiting to 15 brightest stars.
Matching stars: done
*** 0 star pair matches found - need at least six matched stars.
* Previous attempt failed - this is try #12
useScaleDifferences=true
* Reference image: Limiting to 15 brightest stars.
* Target image: Limiting to 15 brightest stars.
Matching stars: done
*** 0 star pair matches found - need at least six matched stars.
* Previous attempt failed - this is try #13
useScaleDifferences=false
* Reference image: Limiting to 8 brightest stars.
* Target image: Limiting to 8 brightest stars.
Matching stars: done
*** 0 star pair matches found - need at least six matched stars.
* Previous attempt failed - this is try #14
useScaleDifferences=true
* Reference image: Limiting to 8 brightest stars.
* Target image: Limiting to 8 brightest stars.
Matching stars: done
*** 0 star pair matches found - need at least six matched stars.
* Previous attempt failed - this is try #15
useScaleDifferences=false
* Reference image: Limiting to 500 brightest stars.
* Target image: Limiting to 500 brightest stars.
Matching stars: done
169 putative star pair matches.
Performing RANSAC: done
* Previous attempt failed - this is try #16
useScaleDifferences=true
* Reference image: Limiting to 500 brightest stars.
* Target image: Limiting to 500 brightest stars.
Matching stars: done
154 putative star pair matches.
Performing RANSAC: done

*** Error:
*** Error: Unable to find an initial set of putative star pair matches.

* Applying error policy: Continue on error.
Loading target file:
I:/David_SRO/Filters/ARP273/CC/900/ARP273-20191027@043228-900S-Luminance-PA004-E-T-20_c_cc.xisf
Loading image: w=4096 h=4096 n=1 Gray Float32
154 FITS keyword(s) extracted.
Structure map: done
Detecting stars: done
Fitting 1781 stars:
550 PSF fits.
Matching stars: done
183 putative star pair matches.
Performing RANSAC: done
* Previous attempt failed - this is try #2
useScaleDifferences=true
Matching stars: done
165 putative star pair matches.
Performing RANSAC: done
* Previous attempt failed - this is try #3
useScaleDifferences=false
* Reference image: Limiting to 250 brightest stars.
* Target image: Limiting to 250 brightest stars.
Matching stars: done
93 putative star pair matches.
Performing RANSAC: done
* Previous attempt failed - this is try #4
useScaleDifferences=true
* Reference image: Limiting to 250 brightest stars.
* Target image: Limiting to 250 brightest stars.
Matching stars: done
93 putative star pair matches.
Performing RANSAC: done
* Previous attempt failed - this is try #5
useScaleDifferences=false
* Reference image: Limiting to 125 brightest stars.
* Target image: Limiting to 125 brightest stars.
Matching stars: done
46 putative star pair matches.
Performing RANSAC: done
* Previous attempt failed - this is try #6
useScaleDifferences=true
* Reference image: Limiting to 125 brightest stars.
* Target image: Limiting to 125 brightest stars.
Matching stars: done
40 putative star pair matches.
Performing RANSAC: done
* Previous attempt failed - this is try #7
useScaleDifferences=false
* Reference image: Limiting to 60 brightest stars.
* Target image: Limiting to 60 brightest stars.
Matching stars: done
22 putative star pair matches.
Performing RANSAC: done
* Previous attempt failed - this is try #8
useScaleDifferences=true
* Reference image: Limiting to 60 brightest stars.
* Target image: Limiting to 60 brightest stars.
Matching stars: done
12 putative star pair matches.
Performing RANSAC: done
* Previous attempt failed - this is try #9
useScaleDifferences=false
* Reference image: Limiting to 30 brightest stars.
* Target image: Limiting to 30 brightest stars.
Matching stars: done
10 putative star pair matches.
Performing RANSAC: done
* Previous attempt failed - this is try #10
useScaleDifferences=true
* Reference image: Limiting to 30 brightest stars.
* Target image: Limiting to 30 brightest stars.
Matching stars: done
*** 0 star pair matches found - need at least six matched stars.
* Previous attempt failed - this is try #11
useScaleDifferences=false
* Reference image: Limiting to 15 brightest stars.
* Target image: Limiting to 15 brightest stars.
Matching stars: done
*** 0 star pair matches found - need at least six matched stars.
* Previous attempt failed - this is try #12
useScaleDifferences=true
* Reference image: Limiting to 15 brightest stars.
* Target image: Limiting to 15 brightest stars.
Matching stars: done
*** 0 star pair matches found - need at least six matched stars.
* Previous attempt failed - this is try #13
useScaleDifferences=false
* Reference image: Limiting to 8 brightest stars.
* Target image: Limiting to 8 brightest stars.
Matching stars: done
*** 0 star pair matches found - need at least six matched stars.
* Previous attempt failed - this is try #14
useScaleDifferences=true
* Reference image: Limiting to 8 brightest stars.
* Target image: Limiting to 8 brightest stars.
Matching stars: done
*** 0 star pair matches found - need at least six matched stars.
* Previous attempt failed - this is try #15
useScaleDifferences=false
* Reference image: Limiting to 500 brightest stars.
* Target image: Limiting to 500 brightest stars.
Matching stars: done
162 putative star pair matches.
Performing RANSAC: done
* Previous attempt failed - this is try #16
useScaleDifferences=true
* Reference image: Limiting to 500 brightest stars.
* Target image: Limiting to 500 brightest stars.
Matching stars: done
153 putative star pair matches.
Performing RANSAC: done

*** Error:
*** Error: Unable to find an initial set of putative star pair matches.

* Applying error policy: Continue on error.
Loading target file:
I:/David_SRO/Filters/ARP273/CC/900/ARP273-20191027@040043-900S-Luminance-PA004-E-T-20_c_cc.xisf
Loading image: w=4096 h=4096 n=1 Gray Float32
154 FITS keyword(s) extracted.
Structure map: done
Detecting stars: done
Fitting 1745 stars:
472 PSF fits.
Matching stars: done
168 putative star pair matches.
Performing RANSAC: done
* Previous attempt failed - this is try #2
useScaleDifferences=true
Matching stars: done
144 putative star pair matches.
Performing RANSAC: done
* Previous attempt failed - this is try #3
useScaleDifferences=false
* Reference image: Limiting to 250 brightest stars.
* Target image: Limiting to 250 brightest stars.
Matching stars: done
98 putative star pair matches.
Performing RANSAC: done
* Previous attempt failed - this is try #4
useScaleDifferences=true
* Reference image: Limiting to 250 brightest stars.
* Target image: Limiting to 250 brightest stars.
Matching stars: done
86 putative star pair matches.
Performing RANSAC: done
* Previous attempt failed - this is try #5
useScaleDifferences=false
* Reference image: Limiting to 125 brightest stars.
* Target image: Limiting to 125 brightest stars.
Matching stars: done
34 putative star pair matches.
Performing RANSAC: done
* Previous attempt failed - this is try #6
useScaleDifferences=true
* Reference image: Limiting to 125 brightest stars.
* Target image: Limiting to 125 brightest stars.
Matching stars: done
34 putative star pair matches.
Performing RANSAC: done
* Previous attempt failed - this is try #7
useScaleDifferences=false
* Reference image: Limiting to 60 brightest stars.
* Target image: Limiting to 60 brightest stars.
Matching stars: done
21 putative star pair matches.
Performing RANSAC: done
* Previous attempt failed - this is try #8
useScaleDifferences=true
* Reference image: Limiting to 60 brightest stars.
* Target image: Limiting to 60 brightest stars.
Matching stars: done
6 putative star pair matches.
Performing RANSAC: done
* Previous attempt failed - this is try #9
useScaleDifferences=false
* Reference image: Limiting to 30 brightest stars.
* Target image: Limiting to 30 brightest stars.
Matching stars: done
15 putative star pair matches.
Performing RANSAC: done
* Previous attempt failed - this is try #10
useScaleDifferences=true
* Reference image: Limiting to 30 brightest stars.
* Target image: Limiting to 30 brightest stars.
Matching stars: done
*** 0 star pair matches found - need at least six matched stars.
* Previous attempt failed - this is try #11
useScaleDifferences=false
* Reference image: Limiting to 15 brightest stars.
* Target image: Limiting to 15 brightest stars.
Matching stars: done
*** 0 star pair matches found - need at least six matched stars.
* Previous attempt failed - this is try #12
useScaleDifferences=true
* Reference image: Limiting to 15 brightest stars.
* Target image: Limiting to 15 brightest stars.
Matching stars: done
*** 0 star pair matches found - need at least six matched stars.
* Previous attempt failed - this is try #13
useScaleDifferences=false
* Reference image: Limiting to 8 brightest stars.
* Target image: Limiting to 8 brightest stars.
Matching stars: done
*** 0 star pair matches found - need at least six matched stars.
* Previous attempt failed - this is try #14
useScaleDifferences=true
* Reference image: Limiting to 8 brightest stars.
* Target image: Limiting to 8 brightest stars.
Matching stars: done
*** 0 star pair matches found - need at least six matched stars.
* Previous attempt failed - this is try #15
useScaleDifferences=false
* Reference image: Limiting to 500 brightest stars.
Matching stars: done
159 putative star pair matches.
Performing RANSAC: done
* Previous attempt failed - this is try #16
useScaleDifferences=true
* Reference image: Limiting to 500 brightest stars.
Matching stars: done
155 putative star pair matches.
Performing RANSAC: done

*** Error:
*** Error: Unable to find an initial set of putative star pair matches.

* Applying error policy: Continue on error.
Loading target file:
I:/David_SRO/Filters/ARP273/CC/900/ARP273-20191027@045047-900S-Luminance-PA004-E-T-20_c_cc.xisf
Loading image: w=4096 h=4096 n=1 Gray Float32
154 FITS keyword(s) extracted.
Structure map: done
Detecting stars: done
Fitting 1883 stars:
615 PSF fits.
Matching stars: done
193 putative star pair matches.
Performing RANSAC: done
* Previous attempt failed - this is try #2
useScaleDifferences=true
Matching stars: done
171 putative star pair matches.
Performing RANSAC: done
* Previous attempt failed - this is try #3
useScaleDifferences=false
* Reference image: Limiting to 250 brightest stars.
* Target image: Limiting to 250 brightest stars.
Matching stars: done
92 putative star pair matches.
Performing RANSAC: done
* Previous attempt failed - this is try #4
useScaleDifferences=true
* Reference image: Limiting to 250 brightest stars.
* Target image: Limiting to 250 brightest stars.
Matching stars: done
76 putative star pair matches.
Performing RANSAC: done
* Previous attempt failed - this is try #5
useScaleDifferences=false
* Reference image: Limiting to 125 brightest stars.
* Target image: Limiting to 125 brightest stars.
Matching stars: done
38 putative star pair matches.
Performing RANSAC: done
* Previous attempt failed - this is try #6
useScaleDifferences=true
* Reference image: Limiting to 125 brightest stars.
* Target image: Limiting to 125 brightest stars.
Matching stars: done
38 putative star pair matches.
Performing RANSAC: done
* Previous attempt failed - this is try #7
useScaleDifferences=false
* Reference image: Limiting to 60 brightest stars.
* Target image: Limiting to 60 brightest stars.
Matching stars: done
22 putative star pair matches.
Performing RANSAC: done
* Previous attempt failed - this is try #8
useScaleDifferences=true
* Reference image: Limiting to 60 brightest stars.
* Target image: Limiting to 60 brightest stars.
Matching stars: done
9 putative star pair matches.
Performing RANSAC: done
* Previous attempt failed - this is try #9
useScaleDifferences=false
* Reference image: Limiting to 30 brightest stars.
* Target image: Limiting to 30 brightest stars.
Matching stars: done
14 putative star pair matches.
Performing RANSAC: done
* Previous attempt failed - this is try #10
useScaleDifferences=true
* Reference image: Limiting to 30 brightest stars.
* Target image: Limiting to 30 brightest stars.
Matching stars: done
11 putative star pair matches.
Performing RANSAC: done
* Previous attempt failed - this is try #11
useScaleDifferences=false
* Reference image: Limiting to 15 brightest stars.
* Target image: Limiting to 15 brightest stars.
Matching stars: done
*** 0 star pair matches found - need at least six matched stars.
* Previous attempt failed - this is try #12
useScaleDifferences=true
* Reference image: Limiting to 15 brightest stars.
* Target image: Limiting to 15 brightest stars.
Matching stars: done
*** 0 star pair matches found - need at least six matched stars.
* Previous attempt failed - this is try #13
useScaleDifferences=false
* Reference image: Limiting to 8 brightest stars.
* Target image: Limiting to 8 brightest stars.
Matching stars: done
*** 0 star pair matches found - need at least six matched stars.
* Previous attempt failed - this is try #14
useScaleDifferences=true
* Reference image: Limiting to 8 brightest stars.
* Target image: Limiting to 8 brightest stars.
Matching stars: done
*** 0 star pair matches found - need at least six matched stars.
* Previous attempt failed - this is try #15
useScaleDifferences=false
* Reference image: Limiting to 500 brightest stars.
* Target image: Limiting to 500 brightest stars.
Matching stars: done
167 putative star pair matches.
Performing RANSAC: done
* Previous attempt failed - this is try #16
useScaleDifferences=true
* Reference image: Limiting to 500 brightest stars.
* Target image: Limiting to 500 brightest stars.
Matching stars: done
147 putative star pair matches.
Performing RANSAC: done

*** Error:
*** Error: Unable to find an initial set of putative star pair matches.

* Applying error policy: Continue on error.

===== StarAlignment: 1 succeeded, 5 failed, 0 skipped =====
18.462 s

5
General / NGC7741
« on: 2019 October 29 07:47:04 »
So after finding the dark master issue I have re-calibrated all of the luminance data and culled the images taken on NGC7741 and have to see if the difference in the resulting 62 frame (15.5 hours) of luminance data is worthy. The raw image seems to show a good deal of what I believe they call inf (background dust) or if it's artifact in the image. How does one tell for sure? I know I have an artifact in the lower center from the field flattener and some off frame star in the upper right but what appears as dust around the galaxy and it's many background galaxies is all over the image. Where is the definitive answer found?

6
General / Some Flat Masters Work, Others Not So Much
« on: 2019 October 25 13:15:42 »
I have pondered this for a long time and have tried different things without any real resolve. My imaging train has remained the same for years and I have been taking panel flats for many years as well. First I should list my system:

I use an Optical Guidance Systems 12.5" RC. From the rear cell I have:

1) the flattener attached
2) MMOAG Off Axis Guider w/SBIG RGH for my STL-11000
3) Optec 3" Pyxis Rotator
4) SBIG CW8
5) SBIG STL-11000M

I image mostly LRGB and those exposures are typically -20 degree at 900 seconds each. The narrow band images are -20 degrees and 1800 second exposures. I take a library of dark and bias frames at -20 and 900/1800 darks. The masters are generally made using anywhere from 20-50 exposures. Master Bias frames are typically from 75-100 bias frames and produced by these guidelines http://www.pixinsight.com/tutorials/master-frames/index.html

When I run into a set of images that seem to have issues flat fielding I will generally try to make a new set of flats and try again but here lately that seems futile. For some reason the flats just don't seem to work. Now to cover my bases I have tried using both east and west masters to see if it makes a difference in the calibrated image but overall not much and neither satisfactory. I had seen in my early days an issue with the software not knowing East side from West side depending on how/where the telescope was parked. When I parked the telescope with the OTA level facing North and the counterweight shaft end facing east (AstroPhysics mount park position 1) it seemed what was my west masters worked for the east images and vice versa.

These days I park the mount with the OTA facing south and the counterweight shaft end facing west (AstroPhysics mount park position 4)

If I have a problem image my process is that I create a plan and have the telescope slew to the object in question at the desired PA and take a short exposure, download, plate solve and then any corrections for PA or object orientation is corrected. Then I'll proceed with new flats now that I'm 100% sure the system is at the desired position. This has yet to solve any of the issues. The flats are minimum of 1 second exposures, 16 each side (E/W), calibrated and combined using the above mentioned process. 99% of the time this works great but that last 1% I'll have a series of images that have poor results. The exposure times are calculated to give a 25,000-28,000 ADU level.

Results for this current series of images is typical of attached. Images taken in 2018 came out without these issues. Not sure what I'm missing.....

7
Installing 1 module(s):
C:/Program Files/PixInsight/bin/InterChannelCurves-pxm.dll
<* failed *>
*** PCL Win32 System Exception: At address 00007FFDD8F2A839 with exception code C0000005 :
Access violation: invalid memory read operation at address 00000000000000D8
** Warning: No modules were installed.

Any idea what needs to be done to get this module installed?

8
General / Problem with flats
« on: 2019 August 03 09:30:56 »
So I started this yesterday and lost the message before posting so here we go again....I've loaded a set of files on my Dropbox account that has one raw light, a set of three flats taken at different times which all appear the same. My target ADU for these is 25,000 ADU. I use a SBIG STL-11000M camera and image at -20. A master dark is used as well as the flat. Due to my imaging train having a rotator I have both east/west flats. What I noticed if using the flats leaves the doughnuts very well pronounced while just using a dark to calibrate seems to tame them considerably. I use an Optec FlatMan XL flat panel and minimum exposure for all flats is 1 second. The images post in the link contain the three different flats, a single raw light that has been
 processed using only the dark, one with both dark and flat (one done using east flat the other using a west flat). Seems I'm missing something. I thought that I had a bad set of flats so I took a new set on two different occasions with the same result. Any idea where I'm messing up? I've been processing images for years and this stumps me. You can see increased vingyetting with the frames using the master flats vs just the master dark.https://www.dropbox.com/sh/28b6m4qot889zei/AAAtiACj9JNSATeM7v7MKZnxa?dl=0

9
General / Blink, Again
« on: 2019 April 08 06:16:09 »
So this is a feature I haven't used much but playing around with it I see it as very useful. Loading images and blinking through them gives you a very good first idea of what's usable. But what I'm seeing is not a great AutoSTF for anything but the first image and that being applied to the rest. Is it possible to apply an appropriate STF to each instead of one for all? The other possibility I see is just loading images all used by one filter and run those separately. Say load all luminance images and run those then the load say red, then green, and finally blue. Or the NB filter selections by group. Point is I guess there's no good way to blink all unless they've been stretched already (nonlinear). Am I wrong about this or missing a feature?

I guess maybe blinking the raw data isn't the best use where blinking say the calibrated and stretched images may give a better representation of the data itself. Case in point is loading of all data from a single image for a nights imaging session looking for any outliers that may be asteroids or other unexpected objects. Loading out of sequence may not be as easy to see these events especially if you acquire data sets as I do by rotating through the filter stack by a set timed period. If I'm taking say 15 minute images I'll do a set of 1 hour exposures for the filter and it may do multiples or a single before moving to another filter or even possibly another object depending on the priorities set. Anyway thought I'd ask.

10
General / Adding Blink Icon to Startup Process Menu
« on: 2019 April 08 05:37:56 »
So when I start PI it loads my chosen startup icons nicely organized in my "normal" workflow but I've noticed that Blink doesn't have the usual characteristic of being able to be copied to the workspace. Is there a workaround so I can have it conveniently displayed as a menu item on the desktop along with my other items on startup?

11
General / Question about combining two RGB images
« on: 2019 March 06 11:39:13 »
I have two images, same data but processed differently and no would like to take these two and combine. What is the simplest means of doing so with Pixel Math? Or should I use another method. Both are nonlinear RGB images.

12
Wish List / Default Folders for Calibration files
« on: 2019 January 27 11:23:54 »
For those of us that use a library of calibration files would it be possible to have defaults that can be save for Darks, Flats, and Bias frames? After creating successful masters I seldom keep the original files and name my masters so dates, exposures and temperatures are obvious in their naming. But when processing a good deal of images from different imaging runs the back and forth eats up time. What I'm requesting is a way to designate the folders so when I calibrate the images and tell the process what dark to use it opens my folder of master darks. When I need to tell it which flat it opens my master Flats folder and I can choose the proper master flat. For me I have to have east/west flats because I use a rotator so I name them by PA/Pier side (E/W), temperature and so on such as PI_AutoFlat_PA025-R-Bin1_East.xisf and so on. Darks are listed in a similar way such as PI_MstrDark-20-900-(#ofExp)-Bin1-xisf so this tells me the master is at -20 for 900 seconds made using 30 darks at Bin 1. The creation date is in the folder headings.

Another nice feature would be if we could turn on auto STF so when we open raw images they are already auto stretched without doing anything further. This allows inspection of the data before processing and we can do preliminary culling accordingly. Just a few thoughts.

13
General / Odd Image Reflections...
« on: 2019 January 27 11:07:13 »
and no idea the source. Looking for detectives to see if there are any rational avenues to follow to rid myself of the rare but destroying artifacts. The latest victim is NGC2359. Maybe this will explain it better.

So I started imaging NGC2359 back in 2016 and have acquired some data every year since but one thing that plagues the images is an artifact that really is something I don’t seem to be able to track down it’s source. I’m not sure if it’s a defect in the flattener, a reflection in the ota, or something in the imaging train. My suspicions are with the flattener but I don’t know how to qualify that. For the record it isn’t an AP flattener and this is using my OGS 12.5” RC with the STL-11002M with optional filter wheel. This type of artifact randomly seems to appear in various images. Let me qualify that, it may appear in some images of the same object regardless of filter used while in other images of different objects there are no traces whatsoever and everything looks normal. Of the images I’ve seen this is LBN999, where there seems to be 3 sets of these arcs while in NGC2359 there is only one and they are in different locations. With Thor’s Helmet I choose a different guide star moving from a PA of 154 to 323 and saw the artifact keep basically the same orientation to the nebula rotated almost 180 degrees. The LBN999 image appears to have 3 sets of these in a triangle in the lower left corner of the image. Image Linking these in TheSkyX shows no extremely bright light sources close to the FOVi.

Any suggestions on how to try and find the source of these artifacts and a possible cure? The one way I think this can be resolved is to remove the flattener and live with the less than round stars in the outer borders of the images but that would be the last resort I would hope. In order to remove this and add spacers to properly distance the sensor would be a good deal of work, doable but not that easily. And then of course I’d need a clear night to test. Plus the library of flats from with the flattener is now useless on new images and a new library would again need to be built. Of course the easiest of all solutions is to accept the fact that I can't image certain objects and simply pass on those. But my heritage has a bit of Irish and that means stubborn of course. All kidding aside, finding the root cause would be the best solution so I could resolve and move on.

Thanks for any suggestions. The images in question can be found here. Actually there are 3 web pages created at different times and they are linked together here https://www.astral-imaging.com/reflections.html.

-Steve

14
General / Remote Install
« on: 2018 November 03 16:03:44 »
I'm trying to install the latest version on a remote computer at SRO which has not had PI installed before. Download is done but using my activation info from my original email from years ago is proving to be an issue. How can I rectify this please?

Thanks,

Steve

15
I've read through all the postings and downloaded as well as installed the module. Fantastic results but one thing I've always been confused about. Is there a difference in using calibrated vs raw images? At this point I've been measuring all raw fits files. Should I calibrate all images and then run them? Sorry for the simple question but the answer escapes me.

-Steve

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