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Orpington Astronomical Society

Astronomy => Astrophotography => Topic started by: Whitters on Aug 09, 2005, 23:11:22

Title: M16 From Headcorn
Post by: Whitters on Aug 09, 2005, 23:11:22
(http://homepage.ntlworld.com/paul_whitmarsh/Astronomy/Images/MX916/August_07_2005/M16_Ha_pw.png)
M16 aka The Eagle or Ghost nebula.
Canon 800mm f5.6 telephoto lens, Starlight MX916 camera
Astronomik Ha filter
60 minutes integration
Title: M16 From Headcorn
Post by: Whitters on Aug 10, 2005, 23:52:49
Different processing sequence.
(http://homepage.ntlworld.com/paul_whitmarsh/Astronomy/Images/MX916/August_07_2005/M16_Ha_pw_1.png)
Stack in API4WIN
Remove star bloat ion Astroart
DDP in Astroart R=1.0, SB=16.0, Toe=17.0, Sholder = 123.0
Photoshop Levels, Curves ad brightness +25
Title: M16 From Headcorn
Post by: Rocket Pooch on Aug 11, 2005, 09:14:06
Hi Paul,

I noticed on this image and a couple of other that they have a false crumpling look, whats causing it, its like looking at a picture through scrumpled up cling film?  Strange, all the details is there and the eagle is excellent, but the crumpling is off putting :-( and change of putting M16 up without that effect.

Chris
Title: M16 From Headcorn
Post by: Oscar the Cat on Aug 11, 2005, 09:52:19
Hi Chris,
Is the crumpling large scale or small scale? I have been experimenting with the minimal filter in photoshop on the first image, and I have decided that I don't like it and wont use it again, it gives the impression of lots of amall scale bubbles on the image. I had a bash on the second image with the star bloat removel filter within Astroart and it seems to give better results, but I will have another go, this time without either.
Title: M16 From Headcorn
Post by: JohnP on Aug 11, 2005, 11:52:03
um....I was wondering who 'Oscar the cat' is...... Now I know!
Title: M16 From Headcorn
Post by: Rocket Pooch on Aug 12, 2005, 08:02:54
hi,

the second image looks much better but its still there its big as well, not positive what's causing it, can you post a stack with darks, flats and bias removal and no processing so we can see if its actually in the image.

meow
Title: M16 From Headcorn
Post by: Whitters on Aug 12, 2005, 09:19:43
RAW

(http://homepage.ntlworld.com/paul_whitmarsh/Astronomy/Images/MX916/August_07_2005/M16_Ha_Raw.png)


AutoLevel
(http://homepage.ntlworld.com/paul_whitmarsh/Astronomy/Images/MX916/August_07_2005/M16_Ha_Raw_AutoStreach.png)


Level and curves Showing extent of nebulosity
(http://homepage.ntlworld.com/paul_whitmarsh/Astronomy/Images/MX916/August_07_2005/M16_Ha_Raw_levelCurve.png)
Title: M16 From Headcorn
Post by: Mike on Aug 22, 2005, 21:18:42
Well the raws look OK so must have something to do with those filters you are using in PS. Might be an idea to try again without using that particular filter cos the raws look good.
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