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Old 24-12-2014, 07:53 AM
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Spookyer (Brett)
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how to process mosaics

Hi all, haven't tried this myself as I often struggle with single images but something I do want to have a go at.

When doing a mosaic what is the work flow for processing?

Does one process each panel separately (but with the same settings applied for consistency) and then combine with some sort of merging software or is there another way of doing it?

Brett
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  #2  
Old 24-12-2014, 08:24 AM
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tilbrook@rbe.ne (Justin Tilbrook)
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Hi Brett,

Stack each frame in DSS but don't process.

Then stitch these panels together, download Microsoft ICE, makes the process so easy.

Then process the mosaic in what ever programme you use.

Cheers,

Justin.
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Old 24-12-2014, 08:49 AM
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mithrandir (Andrew)
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As Justin says, Microsoft ICE is one way. Hugin (http://hugin.sourceforge.net/download/) is another and free. AutoPano (http://www.kolor.com) is the best in quite a few people's opinion but definitely not cheap.
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Old 24-12-2014, 09:28 AM
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multiweb (Marc)
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I tend to process and stretch every panel individually. When done I stitch them with Registar and blend in the seams in Photoshop.
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Old 24-12-2014, 10:22 AM
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rustigsmed (Russell)
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windows live photo gallery (also windows photo gallery) which is probably already on your computer does a good job of stitching.

preferable to stitch straight after DSS as Justin mentioned and processed as one, however if its too much for your computer you may have to go a panel at a time then stitch.
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Old 24-12-2014, 10:37 AM
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Brett,

If you're still persevering with PixInsight the process I'm using is:
  • add panels together one at a time using StarAlignment Register/Union mode and Frame Adaption to create an initial rough mosaic
  • register each of the panels against the rough mosaic using StarAlignment Register/Match mode, using Frame Adaption again
  • Assemble the final mosaic from the registered panels with GradientMergeMosaic

StarAlignment will use previews to restrict the star matching process so you can use this to provide hints where the joins are to expedite the matching process.

If your linear data is good quality then just stitch the panels for each filter together and do the stretch and other processing afterwards. If the quality is not so good you may need to stretch the panels and possibly do NB/LRGB combination first.

There are more exotic techniques and tools for wide fields, distorted images, mosaics with gaps between panels, etc.

Cheers,
Rick.
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Old 24-12-2014, 10:39 AM
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Here's a tutorial video for PI: https://www.youtube.com/watch?v=H2r3ZYqCaP8
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Old 24-12-2014, 03:34 PM
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thanks everyone, that gives me food for thought. Will come back with questions later no doubt.

Merry xmas to all.

Brett
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Old 27-12-2014, 11:30 AM
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Here's an example of poor mosaic planning. The attached image is the map created by the GradientMergeMosaic process in PI which shows the fit between the panels. It took a lot of work just to get it to fit this well! We definitely screwed up the capture on this one and learned from the experience

Cheers,
Rick.
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Old 27-12-2014, 01:48 PM
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Looks like the process in PI is quite involved but produces good results.

The way the weather has been going I don't know why I am looking at mosaics, I can't collect sufficient data for one image!
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Old 27-12-2014, 02:15 PM
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Quote:
Originally Posted by Spookyer View Post
Looks like the process in PI is quite involved but produces good results.

The way the weather has been going I don't know why I am looking at mosaics, I can't collect sufficient data for one image!
Yes, that's a fair comment. You can do amazing stuff in PI but it takes time and effort.

I hope to finish my Veil mosaic today. I've been working on it for a couple of weeks now. It would have been a lot quicker if the data capture had been done better Also if I hadn't drizzled it up to 150 megapixels
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Old 27-12-2014, 05:06 PM
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Looking forward to seeing it.
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Old 30-12-2014, 02:10 PM
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John K
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I actually use CS3 which has a really nifty Automate -> Photomerge function. All you need is the files out of Deep Sky Stacker etc and presto all done ready to be processed then in Photoshop.
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