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Thread: Processing help

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    Default Processing help



    I have read all the stickies on this site and scoured the net for a good tutorial for PS processing of AP images. there is variability with the programs and i cant find a tutorial that fits what u have (PS CC). i usually play with the curves, then levels, then maybe something else. i am not sure if its bad processing or the data is just not there to get the images i am left with.

    is there a set process to getting a good image or is it just playing around until you are happy with it?

    if you have a set of steps you go thru for PS CC i would love to know what it is....
    Adam
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    Default Re: Processing help

    I know there are a bunch of folk that use PS for processing and I am surprised they have not jumped in here yet.

    Maybe post a image of what you have so far so folks can see what the problems are?
    Are you struggling with gradients etc.

    Cheers
    .

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    Default Re: Processing help

    Please post an image. I use DSS + Photoshop. First I stack my images in DSS (Deep Sky Stacker) and then process in photoshop. I use
    Levels, Curves, Layers.
    Before you begin processing. I would suggest you to do some reading on the science behind photography. For eg. understanding the way histogram works, saturation/ hue, RGB, Exposure, blacks, whites, highlights, white balance ...etc.. I would recommend this simple tutorial : https://www.youtube.com/watch?v=FOAmP7A_x6c I mainly use the techniques in that tutorial.

    Another thing that I have discovered, the darker your skies are ..the less processing you have to do, especially if you are able to goto a full dark site (Bortle Scale 2). I have taken pictures of milky way in a dark site and had to do very very minimal editing to get the details out.
    Celestron Edge HD 8" Telescope
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    Adobe Photoshop for processing.

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    Default Re: Processing help

    Quote Originally Posted by Singh.Kd View Post
    Please post an image. I use DSS + Photoshop. First I stack my images in DSS (Deep Sky Stacker) and then process in photoshop. I use
    Levels, Curves, Layers.
    Before you begin processing. I would suggest you to do some reading on the science behind photography. For eg. understanding the way histogram works, saturation/ hue, RGB, Exposure, blacks, whites, highlights, white balance ...etc.. I would recommend this simple tutorial : https://www.youtube.com/watch?v=FOAmP7A_x6c I mainly use the techniques in that tutorial.

    Another thing that I have discovered, the darker your skies are ..the less processing you have to do, especially if you are able to goto a full dark site (Bortle Scale 2). I have taken pictures of milky way in a dark site and had to do very very minimal editing to get the details out.
    Budget AP: M45, best attempt thus far
    this is an image of M45 i took recently. could not get mush nebulosity out of the data, although one comment on the thread suggested i should. when i process in PS, i can bring out some nebulosity, but i feel the image gets really distorted.

    i will watch your tutorial about the science, hopefully it will help
    thanks!
    Adam
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    Default Re: Processing help

    Your M45 image does have some nebulosity in it. You have fairly severely clipped the black, and some of the nebulosity may have gone with it.

    When processing, start with levels. You objective is to remove unused dynamic range from the histogram at both the white and the black ends. You want to remove unused range, but you don't want to remove any part of the range that has data (called 'clipping'). You do this by adjusting the white (right) and black (left) sliders. Once you have done this, you can adjust the centre slider, which will apply a bit of a curve to the image.

    Then, move on to the curves control. The centre slider of the Levels control will apply a 'generic' curve, but the Curves control allows you to apply more complex curves. You never want the curve to touch the top or bottom of the graph, because that will cause more clipping. Don't go back to Levels after you have used Curves.
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    Default Re: Processing help

    Quote Originally Posted by KeithBC View Post
    Your M45 image does have some nebulosity in it. You have fairly severely clipped the black, and some of the nebulosity may have gone with it.

    When processing, start with levels. You objective is to remove unused dynamic range from the histogram at both the white and the black ends. You want to remove unused range, but you don't want to remove any part of the range that has data (called 'clipping'). You do this by adjusting the white (right) and black (left) sliders. Once you have done this, you can adjust the centre slider, which will apply a bit of a curve to the image.

    Then, move on to the curves control. The centre slider of the Levels control will apply a 'generic' curve, but the Curves control allows you to apply more complex curves. You never want the curve to touch the top or bottom of the graph, because that will cause more clipping. Don't go back to Levels after you have used Curves.
    great, a starting point! i will try that when i get home from work tonight. wait i'm on AF at work???
    Adam
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    Default Re: Processing help

    Quote Originally Posted by wvueers View Post
    Budget AP: M45, best attempt thus far
    this is an image of M45 i took recently. could not get mush nebulosity out of the data, although one comment on the thread suggested i should. when i process in PS, i can bring out some nebulosity, but i feel the image gets really distorted.

    i will watch your tutorial about the science, hopefully it will help
    thanks!
    Thats a nice image you got there and I really like the lens that you are using. I feel that you are using a lot of ISO 3200 here. Try to bring down the ISO and increase the exposure time. I find that in my images the ISO just kills the detail with noise. Most of images from light polluted skies, I took at ISO 200 and exposure 4 minutes. I know that you are using a rigid mount and will run into problems with star trails. I'd recommend investing in some type of EQ mount that can follow the stars.
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    Adobe Photoshop for processing.

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    Default Re: Processing help

    Here are some decent free online tutorials
    https://www.youtube.com/user/namregd
    Starizona's Guide to CCD Imaging

    Here are some good ones that you have to pay for, but I highly recommend.
    https://www.adamblockphotos.com/store/c3/Tutorials.html
    http://www.ip4ap.com/photoshop.htm
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    In short, do what Keith said.
    Iterative use of levels and curves without clipping. Learn to use and understand the histogram
    Noise reduction
    Sharpening
    Saturation

    But most importantly, study and practice. Although the free tutorials are fair, you get what you pay for.
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    Default Re: Processing help

    Lots of great advice already. Here's a tutorial that should provide you with a starting point: CORIUS Astronomy » Basic IP

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    Default Re: Processing help

    Hi Adam, I was exactly the same as you with regards to PS, one of the best things I did was to down load some plugin programmes for PS , the free ones are , galaxydustenhance. powerdetailextract HLVG and powersaturate, if you just google them you should find them. Another set of useful plugins are Noels astro tools or Annies astro actions not free but not expensive,Hope this helps Stuart
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