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Thread: Open Image Processing 101

  1. #21
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    Default Re: Open Image Processing 101



    Hi,

    I had a look at your data in ST.
    The data is excessively noisy and it's the main reason a lot of modules in StarTools have trouble locking on to any real signal (e.g Wipe, AutoDev, Auto Mask generator, Decon, etc.).

    Read up on 'Dark anomalies' (in Wipe's help) - Wipe will have trouble locking on to the real interstellar background if you pixels in your image that are darker than it. Bumping up the Dark Anomlay Filter helped in your case.

    This is a simple workflow;

    At the very least, bin to 50% (data is still at interpolated DSLR resolution otherwise) but more is probably better for this data, AutoDev to see what we got, Crop to fix stacking artifacts and framing, Wipe (default settings should do, except bumped up Dark Anomaly Filter), Due to the extreme noise and faint signal, AutoDev has trouble locking on to anything unless you guide it with an ROI and tweak all parameters, so maybe opt for a manual Develop, Life Isolate preset will help push back the noise, Color to taste, Turn off tracking and use the Read Noise compensation parameter to atack the main cause of the noise - the comparatively large read noise component in the signal.
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  3. #22
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    Default Re: Open Image Processing 101

    Thanks Ivo. I've been stacking pairs of lights with no calibration files all afternoon. I think the problem is, once again, high wispy clouds that I couldn't see. I will keep on working on stacking these, but I think the clouds have foiled me again.
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  4. #23
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    Default Re: Open Image Processing 101

    Hey Mike,
    Not sure if you've seen this or not... But I did a little blurb on DSS and the in's and out's of what I know.
    You can use DSS to manually stretch your images by using the pair of sliders in the upper right corner. They work like histogram adjusters. Only they don't do anything to the actual image.

    There's a few more tidbits here...
    DSS my take on a great free program

    Good Luck! I'm D/L'ing your file now to look at it in PixInsight
    Last edited by jimminCT; 03-25-2014 at 10:24 PM.
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    Default Re: Open Image Processing 101

    Here's what I came up with...
    You need a lot more time...

    PixInsight can work magic on data, but it does need data...
    Your red channel is a bit messed up for some reason, but the image itself looks good. Focus and tracking aren't bad at all.

    Mikes M101 V2.jpg
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    Default Re: Open Image Processing 101

    Similar to Jim's comment about DSS, Nebulosity has the same feature, where you can adjust the preview without really stretching it. With Nebulosity, you can also look at the pixel stats which shows the RGB values of individual pixels, and average for the whole image. That's what I used to find the subs that had a higher average than the others.

    I bet there is other software, probably free that could do that too.

    Paul
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    Default Re: Open Image Processing 101

    Hi all,
    I'm a friend of Mike's IRL and he asked me to take a look at it. I saw him at our local astronomy meeting tonight and I went over my thoughts with him, but since he brought it up on this forum, I thought I'd share what I found.

    1) Tracking is good. He did 210 second subs and the stars are nice and sharp and round. I went through each sub and I didn't see any smearing, so his hypertuning worked.

    2) Flats are too dark. The max ADU out of his lightest flat was about 3200. For a Digic 3 processor 14 bit processor you want at least 6000 and ideally 7000-8000 ADU.

    3) I'd do a more aggressive dither. The subs are very close to each other. No reason not to do a more aggressive dither unless you're worried about FOV in a large object (of which this is not)

    4) It's almost pointless to shoot something like M101 on a moonlit night. M101 is bright overall, but has very low surface brightness, and to get above the light pollution you really need to shoot longer subs. In stretching I had a lot of difficulty pulling data out of the background sky glow, which was made worse by the moon. When you do shoot it, use 10 minute subs if your mount will tolerate it.

    That said, here is a link to my attempt at this object. I'll keep it here for a while until I need the room.
    https://dl.dropboxusercontent.com/u/...0stu%20try.jpg

    As you can see, there is a lot of noise, mostly because I had to do big stretches and contrast curves to pull anything out of it. But it's there, and it's pretty, and that's what's important!

    I used CCD stack to do the initial debayering, data rejecting, and stacking. I imported a scaled .tiff to Photoshop and then did levels/curves, gradient exterminator, more curves, color saturation boost, contrast S curve, Neat Image noise reduction, and a final once over with a spot healing brush.

    I'm sure the Pixinsight people could do better with this.

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  9. #27
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    Default Re: Open Image Processing 101

    Wow, thanks again Stuart! When you AF folks see me saying "a very accomplished imager friend of mine said...." well that's most often S24man.
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    Default Re: Open Image Processing 101

    Now I can see the subs, I completely agree. The flats are too dark, the moon/sky is too bright, the subs are too short and dithering is not large enough in scale - dithering is crucial for DSLR imaging.
    The camera sensor (or the CLS filter) needs cleaning too...
    I am stacking in Pi now to see what happens...

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    Default Re: Open Image Processing 101

    Mike

    The red channel is WAY down in the flats which is leading to all sorts of problems... the dust motes barely show up at all in the red channel. - see second attachment - the green channel of the flats is above the red channel - an identical stretch has been applied to both.
    Attached Images Attached Images
    Last edited by Phil Leigh; 03-26-2014 at 01:15 PM.

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    Default Re: Open Image Processing 101

    Quote Originally Posted by Phil Leigh View Post
    Now I can see the subs, I completely agree. The flats are too dark, the moon/sky is too bright, the subs are too short and dithering is not large enough in scale - dithering is crucial for DSLR imaging.
    The camera sensor (or the CLS filter) needs cleaning too...
    Other than that everything is great though, right?
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