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Thread: Announcing the AstronomyForum.net Astrophotography Processing Challenge number 2!

  1. #11
    ghswen's Avatar
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    I've found if you play with levels and curves and really crank the 1st pass up (but don't clip the data!) it will give you a lot to work with. I think a lot of people are trying to get the 'perfect' image on the first passes. If you can pull the data out then go back and work on the details it really seems to work better.

    I agree image 1 above has considerable more detail!

    If I remember correctly you are using PS CS5. (I have CS2)
    Notice the outer edges have quite a bit of coma (comet shaped stars). You can play with "Lens Correction" and remove most of it (it will crop the image some). However you have to be careful as I use a Newtonian and the brighter stars in the middle have "spikes". Using "Lens Correction" will distort the spikes some so go easy.

    Here's where the filter is in CS2

    filter / distort / lens correction

    I've begun using "StarTools" which has a Lens tool also. If you mask the stars out (it will remove the spikes) then run the lens tool to correct the coma you can go back and use a tool called "Synth" and it will add them back in. Really effective.

    Anyway, more stuff to play with!
    Gordon
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    Scopes:
    Explore Scientific ED80CF, Skywatcher 254N, Orion ST80, Orion Atlas EQ-g mount, Orion SSAG guider. Baader MPCC MkIII coma corrector, Vixen 70mm refractor. Lunt LS35THa solar scope. Skywatcher EQ5pro mount. Imagers: ZWO ASI1600 MM Cool, ZWO ASI174mm-C (for use with my Quark chromosphere), ZWO ASI120MC Filters: LRGB, Ha 7nm, O-III 7nm, S-II 7nm Eyepieces: a few, Primary software: Cartes du Ciel, EQMOD, SGP, Nebulosity, Photoshop, StarTools V1.4
    Blog:
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    Quote Originally Posted by Lonnie View Post
    Hope no one minds my "improvement" post's.
    Not at all. This challenge is all about learning. It is generous of you to share your learning process.

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    DSO AP:
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    Newtonian Astrograph; ATIK 383L+; EFW2 filter wheel; Astrodon Ha,LRGB filters; KWIQ/QHY5 guide
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    ; Planetary AP: Celestron C-11; ZWO ASI120MC; Portable: Celestron C-8 on
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    pro; C-90 on wedge; 20x80 binos; Etc: Canon 350D; Various EPs, etc. Obs: 8' Exploradome;
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    .

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    Default Removing Coma with Lens Correction Filter

    So I gave the Lens Correction filter a shot. I think I need a little more practice with it though.

    I opened Lens Correction, clicked on the Custom tab and adjusted the Geometric Distortion to -13, until I noticed the star spike just starting to distort. I clicked OK then cheated a bit. I opened my Star Spike Brush and overlaid a new spike on the star, which corrected the spike distortion. (Seeing how I already had the spike brush out, I touched up the "orangish" spike as well) I re-opened the Lens Correction Filter and again adjusted the Geometric Distortion, this time to -11. That seemed to help the coma quite a bit but has not completely removed it. It did however, crop out some of the bottom portion and increased the size of M20. You can see that the diffraction spike has just started to distort again.
    Attached Images Attached Images

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    Default

    Looks pretty good Lonnie! That upper left corner is a real bear.

    Hopefully all this 'practice' is helping!
    Gordon
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    Scopes:
    Explore Scientific ED80CF, Skywatcher 254N, Orion ST80, Orion Atlas EQ-g mount, Orion SSAG guider. Baader MPCC MkIII coma corrector, Vixen 70mm refractor. Lunt LS35THa solar scope. Skywatcher EQ5pro mount. Imagers: ZWO ASI1600 MM Cool, ZWO ASI174mm-C (for use with my Quark chromosphere), ZWO ASI120MC Filters: LRGB, Ha 7nm, O-III 7nm, S-II 7nm Eyepieces: a few, Primary software: Cartes du Ciel, EQMOD, SGP, Nebulosity, Photoshop, StarTools V1.4
    Blog:
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    Default

    Nice going, Lonnie. That image is really starting to pop!

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    Quote Originally Posted by ghswen View Post
    Looks pretty good Lonnie! That upper left corner is a real bear.

    Hopefully all this 'practice' is helping!
    Haaaa tell me about it! still working on that.

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    Same flow with different end this image is quite the balancing act with give and take.

    Open.
    Curves: RGB lazy s curve bottom low.
    Contrast change to 60
    Brightness to 3
    Red channel 10% reduce
    Curves slight upward bow, high end to mid stay.
    Gaussian blur 0.2
    Lightness -10
    Red channel 10% reduce
    unsharp mask 0.5
    Brightness 6
    Contrast 10
    Space noise reducton C tools.
    Gussian blur 0.2
    Level Changes:
    Green from 0 to6
    Red from 0 to3
    Blue from 0 to 9
    Space noise reduction C tools.
    lasso to level changes.
    Resize 1000x657 with constraints
    challenge 2 master photo try12222.jpg

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    Haaaa that corner. I hope this is better.

    challenge 2 master photo try12222.jpg

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    Default Here is my run at it again using Lightroom 3

    Just seem to be finding for these challenge files the my main photography touch up and PP tool does a good job for me..
    Done in Lightroom 3
    Lightroom3 Settings
    If not listed left to default setting
    Main Settings
    Exposure +3.36
    Recovery 17
    Blacks 44
    Brightness 5
    Contrast -26
    Clarity -100 (keeps stars smaller)
    Vibrance +84
    Saturation -1
    CURVES
    Linear
    Only Shadows -14
    Sharpening
    Amount 74
    Radius 0.6
    Detail 33
    Masking zero
    Noise Reduction
    Luminance 13
    Details 50
    Contrast 15
    Color 39 (neutralizes excessive star color)
    Detail 17
    LENS CORRECTIONS
    Distortion -10

    Then use the adjustment brush todarken the ovelry bright areas.. do this to taste
    Also used adjustment brush to reduce the brightness of the core stars in main cloud
    Then I use screen snip.. because don’t like the EXPORT from LR..
    Ken H. sharing the sky with my 9yr old daughter
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    Default

    Not having purchased a processing program yet I downloaded GIMP and have been playing around with it and reading the manual. Hopeful someone has it and will try an attempt with this challenge so that I can see the flow.
    CHUCK WALTERS SCOPES: Celestron 1100 XLT; EdgeHD 800; Exp. Sci. ED80 APO; AR102; Orion 10" f/4 Astrograph; XT8 LE; Astro Tech AT72ED Coronado SolarMax II 60 BF15 MOUNTS: Celestron CGEM DX; CG-5GT; NexStar 6/8SE CAMERAS: JTW Ice Cube 650D BCF; JTW Ultimate 1100D v3; IS DBK21AU618; DMK21AU04 ZWO ASI120MC; ASI120MM SOFTWARE: StarTools 1.3; PixInsight; RegiStax 6; PHD; BYEOS; APT 2.0; FireCapture 2.2

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