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M33 - Triangulum Galaxy Final Image


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This is my final attempt for this season, ~ 12hrs of data.  Clearly an improvement over my first post of this DSO, I have added 4 hours of data, 2hs of which is L, and the rest RGB.  I was not able to add anymore Ha as I was not able to collect 20 minute subs without blur.  Lots of winds at this time of year, and my TMB sticks about 10 inches over the observatory walls, every long sub had  blurred stars, most of the 10 minute subs avoided this, I only lost about 10% of these.


Processed in PI, I still have a lot to learn, this is the 6th version, and for now this is the best I can do

Criticism appreciated









Resolution: 5673x4991

DatesNov. 5, 2016

Astronomik Ha 6nm CCD: 6x1800" -20C bin 1x1
Astronomik LRGB IIc: 56x600" -20C bin 1x1

Integration: 12.3 hours

Darks: ~25

Flats: ~25

Bias: ~25

Avg. Moon age: 4.72 days

Avg. Moon phase: 23.20%

Bortle Dark-Sky Scale: 6.00




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The thing that strikes me with this is that it is a little on the blue side and there's some background gradient. Both could easily be tackled .... colour balance perhaps in PS and gradient X-Terminator. You've got good data there - Well done :)

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Thanks Sara and Corkeyno2


I agree it is a bit to blue, took your advice and adjusted the color balance in PS.  I also downloaded gradient x-terminator, that helped a lot, thanks for the suggestion


I also downloaded the star shrink plugin, it works well for the most part, except for the pair of red stars in the upper left corner.  When I shrink the stars this pair turns into a funny looking somewhat smeared oblong shape.  Will have to look at the tutorial again and see if I can shrink the stars without this artifact, I will repost after I spend some more time with the star shrink plugin



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Data looks liek a good starting point.  This one has a tendency got get a little blotchy with the detail.  As Sara said carefully managing the colour will help a lot.  Run a DBE early in PI and then use the colourcalibration tools and background neutralisation tools to help nudge it back in the right direction.  You can also run DBE with normalise attribute set which will help.


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Thanks Paddy,


I have taken Sara's advice and applied gradient exterminator, and some color correction in PS, then used star shrink, after that I opened it in PI for final adjustment in the color calibration/background neutralization tools. I also used SCNR to get rid of the slight green hue

I think this looks better.  








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