A Space & astronomy forum. SpaceBanter.com

If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below.

Go Back   Home » SpaceBanter.com forum » Others » Astro Pictures
Site Map Home Authors List Search Today's Posts Mark Forums Read Web Partners

astro: M95 re-done



 
 
Thread Tools Display Modes
  #1  
Old January 15th 08, 11:51 PM posted to alt.binaries.pictures.astro
John N. Gretchen III
external usenet poster
 
Posts: 460
Default astro: M95 re-done

14x240 seconds
Meade 8" Schmidt-Newtonian
Celestron Advanced Series GT
Sbig ST2000XCM
processed with AstroArt and Photoshop

--
John N. Gretchen III
N5JNG NCS304
http://www.tisd.net/~jng3

Attached Thumbnails
Click image for larger version

Name:	m95a.jpg
Views:	234
Size:	450.5 KB
ID:	1607  
Ads
  #2  
Old January 16th 08, 12:04 AM posted to alt.binaries.pictures.astro
Doug W.
external usenet poster
 
Posts: 264
Default astro: M95 re-done

That's pretty John... this one galaxy I have never got a good shot of... It
is not for trying but it is a hard object to get the detail on.

--
Regards, Doug W.
www.photonsfate.com
"John N. Gretchen III" wrote in message
m...
14x240 seconds
Meade 8" Schmidt-Newtonian
Celestron Advanced Series GT
Sbig ST2000XCM
processed with AstroArt and Photoshop

--
John N. Gretchen III
N5JNG NCS304
http://www.tisd.net/~jng3



  #3  
Old January 16th 08, 08:42 PM posted to alt.binaries.pictures.astro
John N. Gretchen III
external usenet poster
 
Posts: 460
Default astro: M95 re-done

Thanks Doug!

Doug W. wrote:
That's pretty John... this one galaxy I have never got a good shot of... It
is not for trying but it is a hard object to get the detail on.


--
John N. Gretchen III
N5JNG NCS304
http://www.tisd.net/~jng3
  #4  
Old January 19th 08, 06:28 PM posted to alt.binaries.pictures.astro
Richard Crisp[_1_]
external usenet poster
 
Posts: 985
Default astro: M95 re-done

nice data and a very interesting object

Like my previous posting to Rick about histograms, you too have some
histogram issues with the data

I took a peek at it in Photoshop and this is what I saw

As you can see on the histogram the blue channel is clipped on the left
(dark) side and the data is overall less in its use of the available dynamic
range. In short it is compressed into a smaller ADU range than the Red and
Green and is skewed to the left (dark) relative to the others.

Your data is good data but I think the image processing is limiting its
potential. If you can reprocess it while paying mind to the histograms I
believe you will have an even nicer image once complete.




"John N. Gretchen III" wrote in message
m...
14x240 seconds
Meade 8" Schmidt-Newtonian
Celestron Advanced Series GT
Sbig ST2000XCM
processed with AstroArt and Photoshop

--
John N. Gretchen III
N5JNG NCS304
http://www.tisd.net/~jng3





Attached Thumbnails
Click image for larger version

Name:	john_histogram.jpg
Views:	107
Size:	538.2 KB
ID:	1621  
  #5  
Old January 20th 08, 03:01 PM posted to alt.binaries.pictures.astro
DvandenH
external usenet poster
 
Posts: 143
Default astro: M95 re-done

Good image John, i tried it too but not as good as this one i can even see
the vey faint outer regions..

Reg
Dirk


"John N. Gretchen III" wrote in message
m...
14x240 seconds
Meade 8" Schmidt-Newtonian
Celestron Advanced Series GT
Sbig ST2000XCM
processed with AstroArt and Photoshop

--
John N. Gretchen III
N5JNG NCS304
http://www.tisd.net/~jng3


  #6  
Old January 20th 08, 05:26 PM posted to alt.binaries.pictures.astro
John N. Gretchen III
external usenet poster
 
Posts: 460
Default astro: M95 re-done

I was aware that the blues were awol and this is on my rainy day rework
list. I'm still trying to get a grip on processing images with this camera.

Richard Crisp wrote:
nice data and a very interesting object

Like my previous posting to Rick about histograms, you too have some
histogram issues with the data

I took a peek at it in Photoshop and this is what I saw

As you can see on the histogram the blue channel is clipped on the left
(dark) side and the data is overall less in its use of the available dynamic
range. In short it is compressed into a smaller ADU range than the Red and
Green and is skewed to the left (dark) relative to the others.

Your data is good data but I think the image processing is limiting its
potential. If you can reprocess it while paying mind to the histograms I
believe you will have an even nicer image once complete.


John N. Gretchen III
N5JNG NCS304
http://www.tisd.net/~jng3
  #7  
Old January 20th 08, 05:29 PM posted to alt.binaries.pictures.astro
John N. Gretchen III
external usenet poster
 
Posts: 460
Default astro: M95 re-done

Thank you Dirk!

DvandenH wrote:
Good image John, i tried it too but not as good as this one i can even
see the vey faint outer regions..

Reg
Dirk

John N. Gretchen III
N5JNG NCS304
http://www.tisd.net/~jng3
  #8  
Old January 21st 08, 11:37 PM posted to alt.binaries.pictures.astro
George Normandin[_1_]
external usenet poster
 
Posts: 1,022
Default astro: M95 re-done


"Richard Crisp" wrote
...
....

Like my previous posting to Rick about histograms, you too have some
histogram issues with the data.......


Richard,

Could this be a artifact of converting to jpg and compression to get to
a decent file size?

George N


 




Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
[sci.astro,sci.astro.seti] Contents (Astronomy Frequently Asked Questions) (0/9) [email protected] SETI 0 May 3rd 07 01:08 AM
[sci.astro,sci.astro.seti] Contents (Astronomy Frequently Asked Questions) (0/9) [email protected] SETI 0 April 12th 07 01:05 AM
[sci.astro,sci.astro.seti] Contents (Astronomy Frequently Asked Questions) (0/9) [email protected] SETI 0 May 3rd 06 12:33 PM
[sci.astro,sci.astro.seti] Contents (Astronomy Frequently Asked Questions) (0/9) [email protected] SETI 0 October 6th 05 02:34 AM
[sci.astro,sci.astro.seti] Contents (Astronomy Frequently Asked Questions) (0/9) [email protected] Astronomy Misc 0 October 6th 05 02:34 AM


All times are GMT +1. The time now is 06:47 AM.


Powered by vBulletin® Version 3.6.4
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
Copyright 2004-2018 SpaceBanter.com.
The comments are property of their posters.