Page 1 of 2 12 LastLast
Results 1 to 10 of 12
  1. #1
    Canon Pete's Avatar
    Canon Pete is offline Moderator
    Points: 42,533, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 0%
    Achievements:
    First 1000 Experience PointsGot three Friends365 Days+ Registered Achievement!200+ Posts Achievement!100+ Threads Achievement!
    Join Date
    Mar 2009
    Location
    Alba
    Posts
    6,248
    Points
    42,533
    Level
    100
    Thanks
    1,753
    Thanked 3,066x 1,997 Posts

    Default Post Processing Astro Images



    Ok Pierre had asked about how certain techniques are applied to images .

    Firstly , there a lot of tutorials online ( thats where I learned ) I strongly suggest that folk look them out , I have included some links for some free ones.

    [ame="http://www.youtube.com/watch?v=KAomnn2Bbus"]Gimp UTube[/ame]

    Gimp Tutorials

    Paint Shop Pro Tutorials

    Learn about your software . Takes time true but, it is worth it .

    Disclaimer !!! ( lol ) I am still learning , and always will be . AP processing is a learning curve , a big one . It would take too much space up here in a single post , to do it justice . Plenty on the net . I intend to try and point out stages/processes that you might want to consider. This is of course assumimg that you have your image train set up for longer exposure. that would include having your mount level and polar aligned ( in S. Hemishere , I think you guys use Octans ? )

    So....
    If using DSLR ....

    #1 use Raw file format , way more data is captured with this medium , Jpeg compresses some of the data , resulting in ''lost data''. Photons are precious , you want as many of them as you can get . Take lots of shots 20 - 30 minimum.

    #2 Keep our ISO between 400 - 800

    #3 Invest in a Light Pollution Filter

    #4 Get good focus on a bright object , use a Bahitnov mask or Preview/Liveview. Manual focus with lens ( Piggy back ) . If your camera can tether to a laptop then check focus that way . If needed , use blutack or similar to lock the focus mechanism.

    #5 Set exposure time's . This will be with ''Bulb'' mode , either on camera menu or via laptop software image capture ( eg, EOS Utilities ). Depending on your mount and alignment accuracy the exposure could be from 30 secs too 5 min +. Camera lens at 18mm should max out at 30 secs exposure with tripod , after that trailing will occur . Prime or Piggy back will be dictated by the accuracy of your mount .

    #6 Depending on your weather conditions , you may have to invest in some Dew prevention system , to stop dew condensing on the lens's or mirrors.

    So you now have an image , be it a wide field star shot ( clusters ) or nebula or galaxy .

    Here is an example of what you will see with a RAw image ..



    Not much to look at , is it ? The data is there but now the magic begins ( magic = frustratingly hard work , lol )

    Ok , you really want to stack your images, most folk use Deep Sky Stacker

    Here' a tutorial , DSS Tutorial

    Once done you have a master file , usually a Tiff format that can be imported into your choice of editing software.

    With practice and care you will be able to extract more detail from the original Raw file/s , resulting in this ....



    you get here by understanding Histogram/Curves/Levels/Brightness&Contrast.

    You may find that your Levels are way over to the left of the Histogram . Use 'Curves to ''move'' the data more to the center , refer to online tutorials .

    I prefer using Curves first over Levels , more control. Then use Level to gain more detail . Go back to Curve's and repeat . I usually do this about four time's.

    Doing it that way you can go from this ..



    to this


    The first image was taken during a Full Moon , as an experiment in processing . The second image was after I processed it with Curve's / Level's / Brightness & Contrast .

    Once you are comfortable with the concept of Curve's /Levels /Brightness & Contrast processing , you can then start to look at Image Sharpening/Masking and a host of others techniques.

    I strongly advise you to taking your time with it . Keep an original copy, save as you go . Things don't work the way you wanted , you still have an original to copy again and work with.

    As I have said , learning AP takes time , I started a couple of years ago and I am still learning . The Internet is a great resource , use it . Practise with your images . Please feel free to ask Q's , myself and others can help out if we can but it's def down to you getting out there and using the scopes and camera's.

    My only gripe ? I dont get enough time to practice because of working night shifts and being in Scotland , I get more than my fair ( IMHO ) share of clouds that stops play.

    Most of all , more importantly , enjoy your star gazing . I usually do visual stuff at the same time as I am capturing data . Best of both worlds in a way .

    Clear Skies

    Pete
    Last edited by Canon Pete; 05-13-2010 at 09:09 PM.
    ---------------------------------------------------

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.

    ---------------------------------------------------
    Cloud Dependant Astro Gear !!!
    10x50, 20x80 Bin's,
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    Canon EOS 600D, EOS 300D ( Baader ACF1 Modded
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    )
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    C80ED, C130 Reflector/EQ3 , Ep's 8mm - 24mm Hyperion Zoom, 40mm SP, 20mm Meade Pl, 10mm Pl , 9mm Meade Pl, Celestron 2x Ultima Barlows. SW Star Adventurer.

  2. The Following 14 Users Say Thank You to Canon Pete For This Useful Post:

    + Show/Hide list of the thanked

    admin (05-15-2010),alsetalokin (09-06-2010),BKBrown (05-13-2010),blaise (05-13-2010),Carolgentle (05-13-2010),Celestron (01-17-2012),Dublin sky watch (05-15-2010),EricFD (05-13-2010),ghswen (05-13-2010),Leo (05-14-2010),mikec (05-14-2010),ozzmozizz (11-18-2010),rick-semi (03-18-2011),somecdnguy (05-13-2010)

  3. #2
    afigueroa's Avatar
    afigueroa is offline SUPER GIANT
    Points: 17,184, Level: 90
    Level completed: 67%, Points required for next Level: 116
    Overall activity: 0%
    Join Date
    Dec 2009
    Location
    Monterrey, Mexico
    Posts
    975
    Points
    17,184
    Level
    90
    Thanks
    486
    Thanked 514x 295 Posts

    Default

    Thanks Pete for this important information.. of course we know the learning curve is extremelly difficult... and algo i would like to add there is no one way to do things.. always you can find different ways for your processing and they will change during your learning curve is improving!!!

    Regards
    Antonio
    120mm
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    Refractor Achromatic f/8.3, Explore Scientific Levy Comet Hunter 152mm f4.9, William Optics Megrez 90 APO, Sky View Pro Mount and Orion Atlas Mount
    Orion StarShoot Pro V2 Color CCD Camera, Canon 1000D (XS) / Orion Starshoot Planetary Imager III
    http://astrofotoamateur.blogspot.com/
    http://www.flickr.com/photos/astrofotoamateur/

  4. #3
    somecdnguy's Avatar
    somecdnguy is offline SUPER GIANT
    Points: 15,062, Level: 84
    Level completed: 61%, Points required for next Level: 138
    Overall activity: 0%
    Achievements:
    10 Days registered200+ Posts Achievement!First 1000 Experience Points365 Days+ Registered Achievement!100+ Threads Achievement!
    Join Date
    Sep 2009
    Location
    Peel Region, Ont, Canada
    Posts
    1,163
    Points
    15,062
    Level
    84
    Thanks
    62
    Thanked 618x 366 Posts

    Default

    Thanks Pete! This is just the right info i was looking for. Added it to my post-processing info binder now.
    Name: Jason
    Member of the Royal Astronomical Society of Canada - Mississauga Centre & Stj÷rnusko­unarfÚlag Seltjarnarness (Iceland)

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    Atlas EQ-G, ES 152mm Mak-Newt, Canon 5DMkll, Canon 60D, EF 70-200mm f/2.8L MkII, EF 24-105mm f/4L, EF 50mm f/1.4

  5. #4
    Carolgentle's Avatar
    Carolgentle is offline HYPER GIANT
    Points: 44,759, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 0%
    Achievements:
    10 Days registered200+ Posts Achievement!Got three FriendsFirst 1000 Experience Points365 Days+ Registered Achievement!
    Join Date
    Oct 2009
    Location
    Edinburgh, Scotland
    Posts
    2,085
    Points
    44,759
    Level
    100
    Thanks
    2,287
    Thanked 1,577x 711 Posts

    Smile

    Thanks Pete, excellent info.
    I'd be lying if I said I understood it but I'll be keeping this post for future reference. AP has a daunting learning curve but I'm gonna take it one wee step at a time.

    Clear skies

    Carol

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    Heritage 130P

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    Optics 8" Dob
    SW120ED on
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    Mount
    Coronado PST
    Panasonic Lumix FZ28, Canon 550D

    http://www.flickr.com/photos/cazagee/

  6. #5
    EricFD's Avatar
    EricFD is offline SUPER GIANT
    Points: 14,123, Level: 81
    Level completed: 93%, Points required for next Level: 27
    Overall activity: 0%
    Achievements:
    Got three Friends200+ Posts Achievement!First 1000 Experience Points20+ Friends Achievement!5+ Referrals Achievement!
    Join Date
    Aug 2009
    Location
    Indianapolis, IN
    Posts
    1,237
    Points
    14,123
    Level
    81
    Thanks
    587
    Thanked 587x 329 Posts

    Default

    Cool, Pete and perfect timing! I've been teaching myself GIMP in the last week or so! I think it's better than Photoshop!
    Name: Eric

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    : Meade 8" Starfinder Dob<br><a href="http://ericfdiaz.wordpress.com/">Eric Diaz's Journal</a><br><a href="http://ericfdiaz.webs.com/">Eric Diaz's Cosmos</a><br><br><a href=http://cleardarksky.com/c/Indianapoliskey.html> <img src="http://cleardarksky.com/c/Indianapoliscs0.gif?1"></a><br><br>

  7. #6
    blaise's Avatar
    blaise is offline Bright Giants
    Points: 16,059, Level: 87
    Level completed: 46%, Points required for next Level: 191
    Overall activity: 0%
    Achievements:
    10 Days registered200+ Posts Achievement!First 1000 Experience Points365 Days+ Registered Achievement!100+ Threads Achievement!
    Join Date
    Oct 2009
    Location
    SC
    Posts
    597
    Points
    16,059
    Level
    87
    Thanks
    80
    Thanked 248x 146 Posts

    Default

    I downloaded Gimp this morning and am really surprised by the difference it makes. I had posted an image of M51 that I thought was unworkable due to light pollution. Gimp took care of it to a great degree.

    Thanks for posting, Pete!
    AT6RC, AT72ED,
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    ST80 (guide
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    ), Celestron 8, SW254N, Canon 450D, Meade DSI (guide cam), Celestron CGEM DX

  8. The Following User Says Thank You to blaise For This Useful Post:

    admin (05-15-2010)

  9. #7
    seal killer's Avatar
    seal killer is offline SUPER GIANT
    Points: 14,850, Level: 83
    Level completed: 50%, Points required for next Level: 350
    Overall activity: 0%
    Join Date
    Apr 2010
    Location
    Kansas City
    Posts
    694
    Points
    14,850
    Level
    83
    Thanks
    1
    Thanked 276x 153 Posts

    Default

    Pete--

    Your post made things clearer as I wade through ImagesPlus Processing and Nikon Capture NX 2.

    I am testing ImagesPlus because . . . no reason, I just am. However, ImagePlus Processing does provide for both a manual, step by step approach and a completely automated approach that appears to work well as long as the original image is not "weird" in some manner. I am too inexperienced to define weird. Some of my images lend themselves to the automated method and some don't. Usually, those with little detail appear to require the manual method.

    I am testing Nikon Capture NX 2 because I already have it. As I pour over Jerry Lodrgruss' "A Guide to Astrophotography" time and time again, it appears to me that the Nikon software is very comparable to Photoshop, but makes things FAR less time consuming without sacrificing control.

    Too bad there is no support for the Nikon product like there is for PS! (Support is king.)

    As others have said, your post is very timely.

    Thanks!

    --Bill
    Nikon D700

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    Atlas EQ-G; Orion ST80 and SSAG
    Astro-Tech 8" f/4 Imaging Newtonian, Meade DS-10
    ImagesPlus Camera Control v3.83a, ImagesPlus Processing 4.0
    iPhone: 39d 10m 11s N, 94d 52m 13s W
    <a href="
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    data-link-preview="0_astrophotography" class="vw-link vw-link-previewable vw-link-auto" href="
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    title="Astrophotography">Astrophotography/Astrophotography.htm">seal killer's Astrophotography</a>

  10. #8
    Dublin sky watch's Avatar
    Dublin sky watch is offline Moderator
    Points: 45,920, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 0%
    Achievements:
    Got three Friends200+ Posts Achievement!20+ Friends Achievement!5+ Referrals Achievement!First 1000 Experience Points
    Join Date
    Dec 2009
    Location
    Dublin,Ireland
    Posts
    6,842
    Points
    45,920
    Level
    100
    Thanks
    1,409
    Thanked 2,537x 1,696 Posts

    Default

    An excellent thread Pete.
    Great information.
    Is it possible to import into DSS while still in raw format?
    I find the files from my camera are quite big (23 MB) per image.
    My work flow is usually as follows.
    1. Capture images.
    2. Make minor adjustments in raw, then save as tiff file.
    3. Manually stack in cs4.
    4. Merge stack to create master file.
    5. Carry out curves adj..etc and save as TIFF file.
    6. Make jpeg copy from TIFF file for Astronomyforum.net.
    I have tried before to import as raw file to dss or registack with no luck.
    Is there something I am missing.
    BTW...this is a great forum site. Thanks for adding it Admin...and great sticky to start with Pete.
    Last edited by Dublin sky watch; 05-15-2010 at 05:47 PM.
    Declan.
    Celestron 8"Edge HD SCT.

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    ED80mm refractor.
    Explore Scientific - 127mm f/7.5 Air-Spaced Triplet ED.
    Lunt - 60mm H-alpha Solar-Telescope with Double Stacked 50 Etalon system, B600 blocking filter and 2 " Crayford Focuser

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    star shoot solitaire autoguider.
    Canon 5D Mark II
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    .
    Two men sat behind prison bars,One saw mud, the other saw stars. It's not where you are, it's what you see!!!

  11. #9
    Canon Pete's Avatar
    Canon Pete is offline Moderator
    Points: 42,533, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 0%
    Achievements:
    First 1000 Experience PointsGot three Friends365 Days+ Registered Achievement!200+ Posts Achievement!100+ Threads Achievement!
    Join Date
    Mar 2009
    Location
    Alba
    Posts
    6,248
    Points
    42,533
    Level
    100
    Thanks
    1,753
    Thanked 3,066x 1,997 Posts

    Default

    Ohhhh , forum for tearing hair from head . Brill !

    Thanks for the kind words folks , I will start to look at doing some other posts , more in depth , maybe start with Curves / Levels , see how we get on.

    Declan, yup DSS has a settings panel that you can tick box your preference, Raw is there.

    See bottom tick boxes


    Your files will be large mate , full frame ( pixel envy here ! )

    Why Manually stack ? In CS3 I use File/Scripts/Load Files Into Stack

    Clear Skies

    Pete
    ---------------------------------------------------

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.

    ---------------------------------------------------
    Cloud Dependant Astro Gear !!!
    10x50, 20x80 Bin's,
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    Canon EOS 600D, EOS 300D ( Baader ACF1 Modded
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    )
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    C80ED, C130 Reflector/EQ3 , Ep's 8mm - 24mm Hyperion Zoom, 40mm SP, 20mm Meade Pl, 10mm Pl , 9mm Meade Pl, Celestron 2x Ultima Barlows. SW Star Adventurer.

  12. #10
    Dublin sky watch's Avatar
    Dublin sky watch is offline Moderator
    Points: 45,920, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 0%
    Achievements:
    Got three Friends200+ Posts Achievement!20+ Friends Achievement!5+ Referrals Achievement!First 1000 Experience Points
    Join Date
    Dec 2009
    Location
    Dublin,Ireland
    Posts
    6,842
    Points
    45,920
    Level
    100
    Thanks
    1,409
    Thanked 2,537x 1,696 Posts

    Default

    Canon Pete

    Why Manually stack ? In CS3 I use File/Scripts/Load Files Into Stack
    At the moment I have only been experimenting with the AP images and have only taken about 4 /6 shots per image, so it has been fairly easy to manually stack them. Plus it gives me a better understanding to the whole image processing..rather then the software doing it all.

    I am delighted this thread has been opened up. As you said earlier it takes time and patients. I am quite sure there are much easier ways to do most of what I do with astronomy.. but thats the fun of learning. Iwill use that tip about the stacking on my next project Pete.
    As ever..thanks Pete.
    Declan.
    Celestron 8"Edge HD SCT.

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    ED80mm refractor.
    Explore Scientific - 127mm f/7.5 Air-Spaced Triplet ED.
    Lunt - 60mm H-alpha Solar-Telescope with Double Stacked 50 Etalon system, B600 blocking filter and 2 " Crayford Focuser

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    star shoot solitaire autoguider.
    Canon 5D Mark II
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    .
    Two men sat behind prison bars,One saw mud, the other saw stars. It's not where you are, it's what you see!!!

 

 
Page 1 of 2 12 LastLast

Similar Threads

  1. Replies: 8
    Last Post: 12-25-2011, 06:23 PM
  2. Getting better at post-processing
    By somecdnguy in forum Astrophotography Image Processing Forum
    Replies: 6
    Last Post: 05-17-2010, 08:13 AM
  3. Astrophotography Post-Processing v3.5 - Now Usable Without MATLAB! :)
    By Gib007 in forum Astronomy Software Forum
    Replies: 37
    Last Post: 12-07-2009, 08:44 PM
  4. Processing Large Images
    By MikeW in forum CCD Imaging Forum
    Replies: 2
    Last Post: 03-19-2005, 02:26 PM
  5. Processing VHS Images
    By Jb2269 in forum Amateur Astronomy Forum
    Replies: 1
    Last Post: 07-31-2003, 01:59 PM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Powered by vBulletin« Version 4.2.0
Powered by vBulletin«
All times are GMT. The time now is 08:32 PM.