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(@mabula-admin)
Quasar Admin
Joined: 5 years ago
Posts: 3117
 

Hi @wei-hao_wang and Kirk @1cm69,

APP 1.060 is nearly there for release 😉

I have implemented Multi-factor (3 factors) dark frame scaling as well, which works very robust. I can see from the factors that the temperature was dropping several degrees during the imaging session and that the temperature was a couple of degrees higher when compared to taking the darks themselves. The factors are dropping each next frame towards 1.25 and the actual darks were shot 90 minutes after capturing the lights according to Wei-Hao's logs, so that makes sense as well.

Here's another result from Wei-Hao's M42-A7 dataset with the improved dark-frame scaling and I removed the bad flats from the flats to make a better masterflat.

APP integration with MultiFactorDarkScaling

Cheers,

Mabula


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(@1cm69)
Red Giant Customer
Joined: 4 years ago
Posts: 133
Topic starter  
Posted by: Mabula Haverkamp - Admin

Hi @wei-hao_wang and Kirk @1cm69,

APP 1.060 is nearly there for release 😉

I have implemented Multi-factor (3 factors) dark frame scaling as well, which works very robust. I can see from the factors that the temperature was dropping several degrees during the imaging session and that the temperature was a couple of degrees higher when compared to taking the darks themselves. The factors are dropping each next frame towards 1.25 and the actual darks were shot 90 minutes after capturing the lights according to Wei-Hao's logs, so that makes sense as well.

Here's another result from Wei-Hao's M42-A7 dataset with the improved dark-frame scaling and I removed the bad flats from the flats to make a better masterflat.

APP integration with MultiFactorDarkScaling

Cheers,

Mabula

That's fantastic Mabula, great work.

I have just loaded the 3 main images from this thread in separate tabs, (1059, 1065 & 1096), clicking on each in sequence and there is definitely a noticeable progression to them.

Image 1096 looks very much even to the eye as well as better colour saturation, mainly the blues are clearer. Plus the stars & nebulosity looks more 3 dimensional.

Looking forward to the next release but willing to wait for you to iron out all the bugs first.

Regards..,

 

Kirk 


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(@1cm69)
Red Giant Customer
Joined: 4 years ago
Posts: 133
Topic starter  

Finally had some spare time to go back over this data using the new version of APP, what a massive difference.

I took on board what Mabula @mabula-haverkamp-administrator had said about the Flats and I manually went through each one and rejected any that showed any form of hard/straight edge & out of the 32 Flats I only used 15.

Anyway, here is my take on the data

St med 1831.0s NR x 1.0 LZ3 NS full qua add sc BWMV nor AA RL MBB5 1stLNC it3 lpc cbg cbg St

One thing that I have noticed Mabula is that when using the 'remove light pollution' tool it automatically adds 'cbg' to the end of the filename as well, this is before I have performed a 'calibrate background', ending as '-lpc-cbg.fits', shouldn't this just be '-lpc.fits'?

Then after doing a 'calibrate background' the filename ending is '-lpc-cbg-cbg.fits' and shouldn't this now be '-lpc-cbg.fits'?

Cheers

Kirk  😉 


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(@mabula-admin)
Quasar Admin
Joined: 5 years ago
Posts: 3117
 

Excellent Kirk @1cm69 😉 !

Indeed, I threw away the same amount of the flats (I believe).

It's a great image by the way 😉 the subtle colors in the nebula are beautiful. Thanks to  @wei-hao_wang for shooting and providing the data, it turned very helpfull for me as well to improve significantly in calibration in APP.

Regarding Light Pollution correction, the tool performs background calibration as well now. This changed a couple of versions ago.

So if you have done LPC, you immediately do CBG (Calibrate BackGround) as well ;-).

The selected areas to perform the light pollution correction can also be used to perform the background calibration, since these areas should be representative of the actual sky background.

Cheers,

Mabula

 


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(@1cm69)
Red Giant Customer
Joined: 4 years ago
Posts: 133
Topic starter  

OK, I must have missed spotting that change before. 

So if I do a LPC, I don’t then need to perform a CBG as it has already been done when the LPC is actioned, is this correct?

cheers,

Kirk


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(@mabula-admin)
Quasar Admin
Joined: 5 years ago
Posts: 3117
 

100% correct Kirk @1cm69.

If the LPC version looks good (due to good LP correction using area selectboxes on the sky background), then the background calibration must be good as well, since it used the LP corrected data from those area selectboxes 😉

Mabula


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(@wei-hao_wang)
Brown Dwarf Customer
Joined: 5 years ago
Posts: 11
 

I apologize for bringing this old thread back.  People seem to reach this thread via internet search from time to time, and used the Google drive link that Mabula provided to access to my files.  Unfortunately Google changed the security policy and the old link no longer works.  (It still leads to the right location, but visitors no longer get permission automatically.) This is the new link:

https://drive.google.com/drive/folders/0B9-mgz7OQ4fnYzJHLTdwZzRldEU?resourcekey=0-qv3VmrBzB3O1564hYvFZOw&usp=sharing

Hopefully with this new link, everyone can automatically get permission to download the files.

 


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