Celestial hemisphere:  Northern  ·  Constellation: Ursa Major (UMa)  ·  Contains:  Bode's Galaxy  ·  M 81  ·  NGC 3031
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M81 - LRGB - Take 2, Anis Abdul
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M81 - LRGB - Take 2

Getting plate-solving status, please wait...
M81 - LRGB - Take 2, Anis Abdul
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M81 - LRGB - Take 2

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Description

I have been having major issues with processing my data lately and figured out that my darks were no matching properly. I was getting three large vertical bands that were messing up the background. It was especially a problem with RGB and Ha data.

I finally reshot darks and it now calibrates the images perfectly. I  had acquired a lot of data on M81 and I lost my way with processing. Lately with my need to try and use all tools like star removal etc, I end up overcooking the data a lot.

Another issue I was having is that, the addition of Ha to my RGB was causing the background to get the red cast. I should have masked the background properly!. 

 I wanted to re-process with new darks it but I had deleted the original frames and only had the calibrated frames (with the bad calibration darks!) . Luckily I had backblaze backing up my data to the cloud (That I almost forgot I had enabled). However, my plan only maintains the history for 1 month and I just about managed to find the data (it was in the Feb 12 snapshot!!) .  Good to know that it actually works

This is a full reprocess from the star. I started by dumping half the data (FWHM < 2.9) and started processing. I did decon but it lowish setting and did not remove all the greens in the image.  I didnt do starremoval type processing. This is the first time I used Masked stretch and it did a good job pulling background while controlling stars. The large stars blew out their peaks but it is a good compromise.

I am quite happy with this version finally (for now ;)

C&C appreciated.
CS
Anis

Comments

Revisions

  • M81 - LRGB - Take 2, Anis Abdul
    Original
  • M81 - LRGB - Take 2, Anis Abdul
    E
  • Final
    M81 - LRGB - Take 2, Anis Abdul
    F

E

Description: Slight background adjustment to show IFN. Removed a bit more green in core

Uploaded: ...

F

Description: Added in Ha layer overlay

Uploaded: ...

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M81 - LRGB - Take 2, Anis Abdul