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Andy Devey
Carpal Tunnel


Reged: 05/06/11

8 January Mosaic attempt - NOW REWORKED new
      #5612917 - 01/08/13 11:23 PM

Hi Guys, I finally tried an attempt at a full disc in photoshop but only managed to make it look like a completed jigsaw. Here are 40 panels put together they spanned from 11:45 to 11:59UT no clouds but I managed to make it look like there were plenty but we have to start some where. Any tips

Regards

Andy



Mosaic attempt

Edited by Andy Devey (01/09/13 06:49 PM)


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raylal
Carpal Tunnel


Reged: 04/19/10

Loc: Cornwall, Ont., Canada
Re: 8 January Mosaic attempt new [Re: Andy Devey]
      #5613199 - 01/09/13 06:53 AM

Awesome !!! Beautiful image, so much detail. It must be a very large file. Congrats on you first attempt. Keep them coming.

Ray


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Jim Chung
Vendor - Icodome
*****

Reged: 12/07/05

Loc: Toronto
Re: 8 January Mosaic attempt new [Re: Andy Devey]
      #5613207 - 01/09/13 07:16 AM

Hi Andy,


I take it this was taken with a PST? You have to either try to subtract a flat or use Gradient Xterminator to even out the light intensity across your pieces so the seams become uniform and less noticeable.

This is my attempt, about a dozen pieces taken at about 1000mm focal length.

http://dl.dropbox.com/u/4852049/FinalTOV2012mosaic3%20copy.jpg


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Aquarist
scholastic sledgehammer


Reged: 08/27/12

Loc: Illinois
Re: 8 January Mosaic attempt new [Re: Jim Chung]
      #5613217 - 01/09/13 07:36 AM

Quote:

Hi Andy,


I take it this was taken with a PST? You have to either try to subtract a flat or use Gradient Xterminator to even out the light intensity across your pieces so the seams become uniform and less noticeable.

This is my attempt, about a dozen pieces taken at about 1000mm focal length.

http://dl.dropbox.com/u/4852049/FinalTOV2012mosaic3%20copy.jpg




Excellent image. Great job!!


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mbucky
Post Laureate


Reged: 10/21/07

Loc: San Diego
Re: 8 January Mosaic attempt new [Re: Aquarist]
      #5613258 - 01/09/13 08:13 AM

hi andy, sharp and loaded with details, quite an eyefull, outstanding work man

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Andy Devey
Carpal Tunnel


Reged: 05/06/11

Re: 8 January Mosaic attempt new [Re: mbucky]
      #5613502 - 01/09/13 11:01 AM

Hi Guys

Thanks for you kind comments, Jim your mosaic of the Venus transit is beautiful. I wish I could have got this with my PST but I was using my triple-stacked very early Solarmax 90 telescope here at 1.6m focal length.

I have a few ideas on how to improve it as I believe my capture data was sound and at the moment I just lack the experience at merging photos. One idea I have, is to generate some brighter images of the dark patches and over lay them and then use the eraser tool at different percentages to try to blend them in better - a bit like making a sculpture?

I will keep you all informed of my progress on this new journey.

Regards

Andy

PS I had to shrink the image size by 30% to get the file size under 2mb to fit on my website.

Edited by Andy Devey (01/09/13 11:02 AM)


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Andrev
Post Laureate
*****

Reged: 02/08/11

Loc: Montreal, Quebec, Canada
Re: 8 January Mosaic attempt new [Re: Andy Devey]
      #5613875 - 01/09/13 02:59 PM

Beautifl Andy, the result is amazing.

Andre


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BYoesle
Post Laureate
*****

Reged: 06/12/04

Loc: Goldendale, Washington USA
Re: 8 January Mosaic attempt new [Re: Andrev]
      #5613925 - 01/09/13 03:25 PM

Great image Andy - very detailed!

From what I have seen triple stacking offers only a marginal improvement in contrast, and tweaking a triple stack filter system seems like it could be a real chore. You therefore might want to try using your two front etalons on another scope - this might help give you better contrast uniformity, which will really help in mosaics at the frame boundaries.

A little shorter focal length (or a larger sensor) will decrease the number of images needed to be stitched together, and I don’t think this would significantly impact the resolution/detail. You could use a focal reducer, but in my experience these seem to decrease the detail of a mosaic.


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Andy Devey
Carpal Tunnel


Reged: 05/06/11

Re: 8 January Mosaic attempt new [Re: BYoesle]
      #5614184 - 01/09/13 06:03 PM

Hi Guys

Many thanks for your comments, I tried with the erazor tool set at 2% to smoothe it out here is the result

Hope you like it

Regards

Andy

Reworked photo


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BYoesle
Post Laureate
*****

Reged: 06/12/04

Loc: Goldendale, Washington USA
Re: 8 January Mosaic attempt new [Re: Andy Devey]
      #5614255 - 01/09/13 06:39 PM

Whoa!

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etalon
member


Reged: 01/07/13

Loc: Germany
Re: 8 January Mosaic attempt new [Re: BYoesle]
      #5614273 - 01/09/13 06:47 PM

Hi @ all,

I am new at cloudy nights and say hello to all

Andy, thats a awesome mosaik from our sun! You use also a very good equipment for that image. To create a full sun mosaik is very difficult. The gradients will kill you! I tried it a few month ago with nearly the same number of pics...

I played a little bit with your original pic from your homepage in PhotoShop. There are very much details in your picture! Follow the link to compare your original with my experiment with your pic:

http://www.deep-sky-images.de/albums/userpics/10002/mosaic__attempt1snew2.jpg

(Attention, 4MB full resolution!)

(I hope, it is ok to work with your pic. If not, tell me and I will delete it immediately) Working with a colored JPG is not pretty good, but it show the potential in your awesome image. That would be much better with your original datas. I hope, it will help a little bit...

cs
Markus

Edited by etalon (01/09/13 06:51 PM)


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Andy Devey
Carpal Tunnel


Reged: 05/06/11

Re: 8 January Mosaic attempt new [Re: etalon]
      #5614286 - 01/09/13 06:55 PM

Hi Markus

That is a superb rework and comparison job thanks for putting the time in I just posted a rework on my original now about 20 hours work put into one picture - I will not be doing that too often making the movies is much much easier for me

A big welcome to the forum

Best wishes

Andy


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etalon
member


Reged: 01/07/13

Loc: Germany
Re: 8 January Mosaic attempt new [Re: Andy Devey]
      #5614310 - 01/09/13 07:09 PM

Hi Andy,

thank you for your welcome!

Absolutly, I feel with you... It is a hard business to create mosaiks, and for sure, I will not do that every day...

cs
Markus


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Jim Chung
Vendor - Icodome
*****

Reged: 12/07/05

Loc: Toronto
Re: 8 January Mosaic attempt new [Re: etalon]
      #5614581 - 01/09/13 10:01 PM

Andy & Marcus,

You have to let the rest of us know what type of processing magic you used to get such excellent results!!!!


Jim


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genethethird
sage


Reged: 01/05/10

Loc: NC
Re: 8 January Mosaic attempt new [Re: Jim Chung]
      #5614672 - 01/09/13 11:03 PM

Hellllo new desktop! Nice work.

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astrovale
Carpal Tunnel
*****

Reged: 02/19/06

Loc: Rimini, Italy
Re: 8 January Mosaic attempt new [Re: genethethird]
      #5615311 - 01/10/13 11:25 AM

WOW Andy! Fantastic job: congrats!

Luca


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Andy Devey
Carpal Tunnel


Reged: 05/06/11

Re: 8 January Mosaic attempt new [Re: astrovale]
      #5616070 - 01/10/13 07:05 PM

Hi Guys

Thanks for the encouraging comments, just before I started filming for the mosaic I spent an hour capturing three movies, here is the first the new AR1654 between 10:28 and 11:28UT

I hope you like it.

NE limb movie


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raylal
Carpal Tunnel


Reged: 04/19/10

Loc: Cornwall, Ont., Canada
Re: 8 January Mosaic attempt [Re: Andy Devey]
      #5616138 - 01/10/13 07:41 PM

Congrats Andy, a significant improvement with the erasor. Looks greta now.

You sure are busy, the movie is fantastic. Thanks for sharing.

Ray


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etalon
member


Reged: 01/07/13

Loc: Germany
Re: 8 January Mosaic attempt new [Re: raylal]
      #5616768 - 01/11/13 07:31 AM

Hi Jim,

there is no magic...

It would be a long post to explain it in detail, but I can write the rough steps of my image processing:

Itīs important to work with b/w pics, because its much easier as with colored pics. If you have only colored pics, it would be easier to process each color channel for itself.

1. Put the images together (with PS layers). Take care for image details to prevent doubling it, and it would be good, if you have a 50% overlap in each image. So you can terminate regions of bad seeing...

2. Smooth the overlap of each image to an other. Choose the softest overlap, which is possible without get white parts in the picture (using masks in PS)...

3. After reducing to one background layer, select the solar surface with a smooth selection (without the spicules and prominences) and process it separate.

4. Flatfielding from the solar surface with artificial flats. With hard gradients, you must do that 3-4 times. Than you have a homogen bright image, but you also have terminated the natural solar limb darkening.

5. Create the solar limb darkening. The easiest way is to double the solar surface layer and use Gradient Xterminator. Than use layer transparency to adjust it by taste or like the original image.

6. Than combine the surface Image with the separate adjusted prominence image (adjust with levels and curves). After combining, use a high pass filter to sharpen the image by taste.

7. Color the image by taste.

I hope, that would answer your question a bit, because the real image processing train is much more voluminous...

@Andy,

cool animation. It seems, you have luck with your weather at home. Here in Germany itīs cloudy since weeks and if itīs clear, Iīve terrible seeing. So, please show us more of your detailed pics!

Best,

Markus

(sorry for my bad english...)

Edited by etalon (01/11/13 07:36 AM)


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Aquarist
scholastic sledgehammer


Reged: 08/27/12

Loc: Illinois
Re: 8 January Mosaic attempt new [Re: etalon]
      #5616879 - 01/11/13 09:11 AM

Excellent processing job on the "rework" Markus. Yes, we too have less than ideal weather at the moment, but that too will pass.

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