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    Default Help Process in Star Tools?



    Was wondering if some of you would like to take a shot at processing this for me preferably in Star Tools.
    I am more interested in this as a learning experience rather than having a keepsake.

    NGC7293 (Helix Nebula) - I took 40 subs @ISO1600 @ 120 sec = 80' total integration. Almost 1/2 of the subs were discarded due to this being un-guided. So total time = 50'.
    Canon T2i un-modded but with the LDS D1 filter. My time for capturing was limited due to the object being at around 45* South and I have trees and houses to contend with.
    Darks, Flats and Bais were used. Image is noisy. Sensor temps were 82-86F.
    Histogram was at 2/3 from the RIGHT in BYEOS. I tried this exposure since I discovered that the BYEOS is a stretched jpeg and should be exposed further to the right.

    Note - The one part that confuses me is that video tutorials I try to follow (Star Tools) always show them starting with a detailed image (almost stretched in appearance). Yet, everything you read says that if it's really dark (like mine) that's what you want. So trying to follow their work flow is difficult since they are already starting with a detailed image.

    I know the data is only fair. Lots of issues going on in the bottom right area due to neighbors lights being on and object was not very high. But am just curious as to what can actually be accomplished with this data.
    Anyway, here is the link:
    https://www.dropbox.com/s/4a8u2o1lgo...%20ST.TIF?dl=0


    Thanks for any help.
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    Default Re: Help Process in Star Tools?

    John, as soon as I can get the missus of the big PC and facebook I will have a crack at it.
    Busy downloading the image now.

    Be warned though, my processing skills are not that sharp either.
    I also still have a bunch to learn in star tools but will give your image a whirl!
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    Default Re: Help Process in Star Tools?

    Hi John,

    I gave your data a shot in ST. You have a few issues going on with the data.

    It appears you have taken fairly short images (120 secs) and even though you have quite a few, the object your are attempting to image is fairly faint and with a un-modified DSLR it just takes more exposure time.

    In addition you mentioned the noise in the image. (yes!!!)

    The only way I could get anything decent was to crop the image down to get rid of some of the surrounding noise but it is still pretty faint. (I will play a bit more and post later)

    HOWEVER with that being said,

    Let me link you to an old contest we had some years back. This has data and also has details on how each member processed the 'Challenge' image. The threads are closed as the contest / challenge is long over with. However the data is still there to play with. You can reference with a link which Challenge you used so folks can see what you did.

    Some of the 'challenge' data is tough and others are easy so it should give you some good examples.

    Here's a link to the old 'Challenge' stuff: Challenge Contest Hall of Fame!
    Gordon
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    Default Re: Help Process in Star Tools?

    Quote Originally Posted by ghswen View Post
    Hi John,

    I gave your data a shot in ST. You have a few issues going on with the data.

    It appears you have taken fairly short images (120 secs) and even though you have quite a few, the object your are attempting to image is fairly faint and with a un-modified DSLR it just takes more exposure time.

    In addition you mentioned the noise in the image. (yes!!!)

    Thanks Gordon. The only reason I went after NGC7293 was I have an excel sheet that someone posted awhile back showing what the best/brightest/largest Nebulas were. M27 came out MUCH brighter; and the Helix was listed as being the same Mag but even larger. Plus, in my area, it was really the only Nebula that I could go after. As mentioned, it wasn't very high in the south sky whereas M27 was almost at zenith so that may have had something to do with it.
    John...... Listentothestars.net
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    Default Re: Help Process in Star Tools?

    I have to agree with Gordon, you need more time on target to get more signal and the noise is plentiful!

    This was a quick and dirty run through ST.


    NGC7293 ST(1).jpeg
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    Default Re: Help Process in Star Tools?

    Quote Originally Posted by My 2 Stars View Post
    Thanks Gordon. The only reason I went after NGC7293 was I have an excel sheet that someone posted awhile back showing what the best/brightest/largest Nebulas were. M27 came out MUCH brighter; and the Helix was listed as being the same Mag but even larger. Plus, in my area, it was really the only Nebula that I could go after. As mentioned, it wasn't very high in the south sky whereas M27 was almost at zenith so that may have had something to do with it.
    I have found that shooting objects, in light pollution, with a DSLR (especially an un-modded one) is tough. Un-guided and low in the sky just makes it that much harder.

    It's a game of 'balance'. Exposure times, ISO, location of object, if the moon is up, pollution, etc etc. Just keep at it some nights are great, others not so much.

    PS I'm still working on your data in StarTools. I have the object pretty well defined, just trying to clean up some of the noise. Hopefully will get it posted soon.
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    Default Re: Help Process in Star Tools?

    Looks like the others have taken a pretty good look at it.

    I will give it a pass when I get home tonight but don't promise any miracles

    BTW is there any chance of putting up the individual subs? A lot of the image processing and preparation for a 'stacked' sub takes place in DSS long before it is opened in Star Tools
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    Default Re: Help Process in Star Tools?

    Quote Originally Posted by My 2 Stars View Post
    Thanks Gordon. The only reason I went after NGC7293 was I have an excel sheet that someone posted awhile back showing what the best/brightest/largest Nebulas were. M27 came out MUCH brighter; and the Helix was listed as being the same Mag but even larger. Plus, in my area, it was really the only Nebula that I could go after. As mentioned, it wasn't very high in the south sky whereas M27 was almost at zenith so that may have had something to do with it.
    So with 7293, yeah, a similar magnitude as M27, but these magnitude ratings are applicable if all of the light emanating from the object were to be squished down into a point source like a star. Stretch that little point out like a wad of silly putty and you start to get thinned out and diffuse. With the Helix having a much larger angular size compared to M27, it thus has a much lower surface brightness and hence is much fainter than M27, meaning more time on target required.
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    Default Re: Help Process in Star Tools?

    Quote Originally Posted by UlteriorModem View Post
    Looks like the others have taken a pretty good look at it.

    I will give it a pass when I get home tonight but don't promise any miracles

    BTW is there any chance of putting up the individual subs? A lot of the image processing and preparation for a 'stacked' sub takes place in DSS long before it is opened in Star Tools
    The problem with putting up 'subs' is you would have to include the 40 plus Flats, Darks, Bias, and Lights. (at full size!) I don't think most forum servers could handle the load!!!

    Anyway.

    Here's my attempt...... NGC7293 STghs version.jpg

    It took quite a bit to get the noise down then some 'creative' stuff with bring out the nebula. I had to attempt and re-attempt so the pattern of processing wouldn't be fair to you.

    My suggestion would be to start with the "DEV" tool NOT the 'auto dev'. Once you can see the nebula do a 'crop' to get the image down to a workable size (approx 1000 px max!) Do a number of 'Wipes' to get the gradient down. Then do a "repair" to round out the stars. From there do your "tracking" for the noise and set the "grain size" to about 9.5 pixels, that should help with the noise. From there it's just a matter of playing with tools to get the colors / contrast the way you want them.
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    Default Re: Help Process in Star Tools?

    I don't think most forum servers could handle the load!!!
    Dropbox

    Hrm... I had always heard that multiple wipes were a bad idea. You an end up with clipping /shrug

    Seems like yours came out okay.
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