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  #1  
Old 12-07-2013, 09:13 PM
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ozstronomer (Geoff)
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M83 under dark Skies - Reprocessed in Pixinsight

After a few suggestions from Rick, Andrew and Robin I thought I'd re run this through Pixinsight.

There is now some blue coming and looking a little better IMHO.

Comments/ Suggestions welcome - Geoff


I through I had a chance to grab a week under dark skies over the school holidays.

RGB, 12 x 5min each channel + Darks and Flats with a W.O. FLT110 and Moravian G2-8300 camera.

Not sure if the colour is getting there as other Images I've seen have more blue in the arms.

Comments/ Suggestions welcome

Thanks for looking, Geoff
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Last edited by ozstronomer; 15-07-2013 at 09:43 PM.
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  #2  
Old 12-07-2013, 09:49 PM
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Nice work, Geoff! You have some nice detail and decent colour in the stars. Did you do anything to calibrate the colour? If you're using PI, ColorCalibration using the whole galaxy will probably work well (on the assumption that the average colour of the whole galaxy is white). You might need to bump up the saturation as well - use a Luminance mask and curves.

Cheers,
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Old 12-07-2013, 10:08 PM
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Looking good so far Geoff. When did you get some clear skies?
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  #4  
Old 13-07-2013, 07:25 AM
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Thanks for the comments Rick and Allan, I'll try out that PI sequence and see how it goes.

Geoff
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  #5  
Old 13-07-2013, 11:26 AM
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Nice image - I think it's probably a more accurate colour rendition than most. If you're using the pixinsight LRGB combine process in the manner recommended, where in the second step you recombine RGB and luminance, you can boost the colours by sliding the saturation slider to the left - this will give the effect you're looking for. I did that and got this slightly oversaturated version that picks out the stellar populations nicely which may be what you're describing?
cheers,
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  #6  
Old 13-07-2013, 12:06 PM
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Thanks Andrew, I see what you mean.
I'll give that a try.

Geoff
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Old 14-07-2013, 01:06 AM
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Needs more colour Geoff.
It's in there.
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  #8  
Old 15-07-2013, 09:44 PM
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Bump
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Old 15-07-2013, 09:57 PM
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Geoff! Didn't comment first time around (forgot), but that repro is lookin good!
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  #10  
Old 15-07-2013, 10:16 PM
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Yes, looking a lot better, Geoff!
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  #11  
Old 16-07-2013, 06:56 AM
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Thanks Troy and Rick, much happier with the repo

Cheers Geoff
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  #12  
Old 16-07-2013, 11:55 AM
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Lots of blue now! What did you end up doing to bring it out?
Cheers,
Andrew
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  #13  
Old 16-07-2013, 04:36 PM
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The repro looks great Geoff. A major improvement. As Robin notes, it does look like there is more data in there that can be tweaked further. Don't be afraid to push the data hard at least in the beginning so that you know what you've got to work with. You can then determine the strengths/weaknesses of the image and work on emphasising the good points and suppressing the bad. Colour looks spot on in the repro. I'd perhaps raise the black point more which will give provide greater colour saturation. If so desired, a light application of a high pass filter around 1.8 pixels will bring out the dark dust lanes more along with making the HII regions pop - needs to be masked to protect the stars. There is probably similar routines in PI. Overall a great result. More please.
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  #14  
Old 16-07-2013, 04:45 PM
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Looks good

PI is great once you get the hang of it

I find when I push saturation that the stars acquire a yellow cast - you seem to have avoided this though there are quite a few orange ones in there.

Pete
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  #15  
Old 16-07-2013, 08:13 PM
Ross G
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Great looking galaxy photo Geoff.

The stronger the colour the better.

Ross.
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  #16  
Old 16-07-2013, 08:22 PM
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Quote:
Originally Posted by alocky View Post
Lots of blue now! What did you end up doing to bring it out?
Cheers,
Andrew
Andrew, I started from scratch and reprocessed taking care with colour balance.

Quote:
Originally Posted by jase View Post
The repro looks great Geoff. A major improvement. As Robin notes, it does look like there is more data in there that can be tweaked further. Don't be afraid to push the data hard at least in the beginning so that you know what you've got to work with. You can then determine the strengths/weaknesses of the image and work on emphasising the good points and suppressing the bad. Colour looks spot on in the repro. I'd perhaps raise the black point more which will give provide greater colour saturation. If so desired, a light application of a high pass filter around 1.8 pixels will bring out the dark dust lanes more along with making the HII regions pop - needs to be masked to protect the stars. There is probably similar routines in PI. Overall a great result. More please.
Thanks Jase, I'll try out the high Pass filter

Quote:
Originally Posted by pvelez View Post
Looks good

PI is great once you get the hang of it

I find when I push saturation that the stars acquire a yellow cast - you seem to have avoided this though there are quite a few orange ones in there.

Pete
Thanks Pete, I'm much happier with the repo

Quote:
Originally Posted by Ross G View Post
Great looking galaxy photo Geoff.

The stronger the colour the better.

Ross.
Thanks Ross, I do like the stronger colour as well
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  #17  
Old 20-07-2013, 10:07 PM
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I missed this one Geoff - some nice data - the repro really does it justice.

Rob
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  #18  
Old 20-07-2013, 10:11 PM
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Quote:
Originally Posted by RobF View Post
I missed this one Geoff - some nice data - the repro really does it justice.

Rob
Thanks Rob, finally getting the hang of Pixinsight...sort of
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  #19  
Old 20-07-2013, 10:17 PM
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Big improvement Geoff, you will have to give me lessons at Astrofest.
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  #20  
Old 20-07-2013, 10:21 PM
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Quote:
Originally Posted by allan gould View Post
Big improvement Geoff, you will have to give me lessons at Astrofest.

I'm no expert Allan, but happy to help
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