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Data, Data, Data... [FITS Provided, Lots of them!]

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#251 rockstarbill

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Posted 29 September 2019 - 12:56 PM

Okay, the data has been uploaded to the CN Data Share

 

It is important to note that this much more advanced than previous data shares have been. I personally used APP with these masters, to complete the mosaic masters, then pulled those back into PI to move forward.

 

One more thing, when you have your 3 mosaic masters (HA, OIII, and SII) and go to register them in PI to one another, I was getting strange star artifacts when using "Auto" for Pixel Interpolation settings in the Star Alignment module. I was able to resolve that problem by using Bicubic B-Spline. 

 

Edit: As always, people are welcome to use the data -- but please credit me as the one that captured it. Especially with this data set. 


Edited by rockstarbill, 29 September 2019 - 11:14 PM.


#252 Bretw01

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Posted 02 October 2019 - 11:29 AM

My first attempt at a mosaic:

 

Yesterday I struggled with it. Gradients at the seams, I made improvements but was not able to eliminate them in the OIII files. The Ha I got something I could work with. Didn't even try the SII. Decided to go to bed and try again today.

 

Last night I saw an email while at work about PI 1.8.7 released with updates to star-alignment and mosaic gradients. Installed it this morning when I got home and saw an improvement right away.

 

After creating 3 mosaics and combining them, I have what I think is a decent image. No noise-reduction or color enhancements, just a quick processing to see what I got. The files are huge and will take some time to process correctly, but here is what I have so far. I plan on working on this when time allows, and will post the final image when complete.

 

SHO palette.

 

Awesome work Bill!

 

SHO_ABE.jpg

 

 


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#253 rockstarbill

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Posted 02 October 2019 - 08:11 PM

Now try APP for the mosaic, and it is a cakewalk. No seam problems (with the right amount of MBB enabled, HA used 15%, OIII used 21%, and SII used 15%).



#254 Bretw01

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Posted 03 October 2019 - 12:18 PM

Sorry Bill, but I do not have APP. I downloaded the trial a while back, and didn't like it enough to purchase. I have read that it is great for mosaics, but never having attempted one there was no need.

 

I played with the files some more today. Narrow band gathers some really great detail, but finding a color palette I like is difficult. I like a color that fits to the RGB scheme, and the NA and Pelican area has some deep reds when using OSC so I went for that. If I ever buy a mono camera I may well stay with LRGB filters.

 

For pixelmath I used:

R  OIII*.6+Ha*.2+SII*.2

G  SII

B  SII*.9+Ha*.1

 

Background neutralization.

I did some NR also, but very light-handed with it. Barely noticed a difference.
TGV, MMT and ACDNR.

Colorsaturation - 

 

Extracted luminance from the RGB file - deconvoluted and NR-again lightly. Also mildly applied localhistogramequalization.

 

Both the RGB and L stretched with HT.

 

LRGB combination

 

I think this shows much more detail than the SHO version, especially in NGC7000.

 

Natural_ABE_PIPS.jpg

 



#255 Bretw01

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Posted 04 October 2019 - 08:58 PM

Now try APP for the mosaic, and it is a cakewalk. No seam problems (with the right amount of MBB enabled, HA used 15%, OIII used 21%, and SII used 15%).

I gave APP a try, the Ha came out nicely on the first try.

 

Screen-Shot-Ha.jpg

 

Not so good with the other files. I tried with the same settings as Ha, then played with MBB but couldn't clean up where the cake was cut. Looks like a flat is being applied, but none were loaded. Tried with "same camera and optics" checked and unchecked.

 

Screen-Shot-OIII.jpg

 

Screen-Shot-SII.jpg

 

This program is still new to me so am still learning it, not sure what to try next.


Edited by Bretw01, 04 October 2019 - 09:01 PM.


#256 rockstarbill

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Posted 04 October 2019 - 09:03 PM

Turn off LNC/Local Normalization. Those are masters and there is no need for it.


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#257 Bretw01

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Posted 05 October 2019 - 02:13 AM

That did the trick.

 

Mosaics generated in APP, processed in PI. I went back to SHO color scheme, and added a luminance created from the SII and Ha frames.

 

I do like APP better for generating the mosaics.

 

View on astrobin.

 

get.jpg?insecure


Edited by Bretw01, 05 October 2019 - 02:15 AM.

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#258 Blender

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Posted 05 October 2019 - 10:58 PM

Trying out PI and hadn't seen many of M51 (compressed .jpg does not do this justice...):

 

Image07_clone_ABE2_clone1_ABE_clone1.jpg


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