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 Post subject: Moon (re)processing
PostPosted: Sun Jan 23, 2011 1:14 am 
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If I have this done right, then for those with bigger monitors you will see the moons side by side, and with smaller monitors you will get them vertically.

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Canon 50D with Celestron Nexstar 4 SE scope and 2x barlow. 1/60s, 2650mm, f/26, ISO1250. This is a stitch of multiple images taken on 6 December 2008, and were my best ever detail shots of the moon to date.

First shot as originally edited. Second is a quick reprocess based on what I do now.

At the time my processing was pretty basic. I'm not sure if I even played with contrast on this shot. I think I did, but left it alone as the... two white spots on lower right would always blow out badly when I did. Also the noise wasn't pretty and I remember making the image greyscale to hide it.

The image on the right is in colour, even if the shades might be a bit subtle to notice. So what have I done differently this time around?

Multiple unsharp mask runs. On the original mosaic I have (44MP equiv) I did at least a couple unsharps on it at large radius (40-80 pixels). This bought out the features without altering the overall image brightness. In this case it works much better than simple global contrast adjustment.

Noise reduction. I set Neat Image to remove 100% chroma noise and 35% luminance noise I think. Chroma noise is unsightly, and while it can affect subtle colours in texture, that isn't a problem here so can fire on full strength. The luminance noise reduction is still a balance between detail and sharpenss, so I went for a low-moderate strength as a balance here. The system is clearly in the diffraction limited region, so pixel level sharpness was impossible at this scale anyway.

When resizing down to the small size image here, I took some additional steps. Firstly I corrected one negative side effect of unsharp, which is an excessively bright border between the moon and sky due to the local contrast boost. I simply selected the sky with the magic wand tool, and expanded a feather into the moon. Press delete, and the white border is gone. I should have mentioned before, but this moon was on a new layer with the original still present in a layer below, so that filled in the border and space again.

And finally to really crisp up the detail, I ran a 0.5 pixel radius sharpen around 30% strength. Subjectively, even balancing the strength I thought it made some crater highlights a bit harsh, so I set the edited layer transparency to 90% to let though a bit of the original.

And that's what's above in the 2nd pic.

It's still not perfect, as the unsharps were blowing some crater highlights so I can still optimise it a bit further there. I might play about with this again before I post a bigger version.

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Canon DSLRs: 7D, 5D2, 1D, 600D, 450D full spectrum, 300D IR mod
Lenses: EF 35/2, 50/1.8, 85/1.8, 135/2+SF, 28-80 V, 70-300L, 100-400L, TS-E 24/3.5L, MP-E 65, EF-S 15-85 IS
3rd party: Zeiss 2/50 makro, Samyang 8mm fisheye, Sigma 150 macro, 120-300 f/2.8 OS, Celestron 1325/13
Tinies: Sony HX9V.


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 Post subject:
PostPosted: Sun Jan 23, 2011 7:33 am 
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It's a nice result popo and proves it's well worth revisiting our older images with our latest processing techniques and tools...


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 Post subject:
PostPosted: Sun Jan 23, 2011 10:24 am 
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Nice one, popo. 8)

Bob.

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Astrophotography: TEC 140 'scope, FLI ML16803 camera, ASA DDM60 Pro mount.


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 Post subject:
PostPosted: Sun Jan 23, 2011 10:45 pm 
Just facinating images.. especially the second one!


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 Post subject:
PostPosted: Mon Jan 24, 2011 8:12 pm 
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Location: Bristol, UK
Nicely processed. The second version, certainly 'looks' a lot sharper with more detail being brought out.

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Lee Diggle
My Astronomy Blog | My Photography Gallery


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 Post subject:
PostPosted: Mon Jan 24, 2011 11:37 pm 
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Posts: 1977
awesome popo..

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