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8 January Mosaic attempt - NOW REWORKED

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#1 Andy Devey

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Posted 08 January 2013 - 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

#2 raylal

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Posted 09 January 2013 - 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

#3 Jim Chung

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Posted 09 January 2013 - 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.co...osaic3 copy.jpg

#4 Aquarist

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Posted 09 January 2013 - 07:36 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.co...osaic3 copy.jpg


Excellent image. Great job!!

#5 mbucky

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Posted 09 January 2013 - 08:13 AM

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

#6 Andy Devey

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Posted 09 January 2013 - 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.

#7 Andrev

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Posted 09 January 2013 - 02:59 PM

Beautifl Andy, the result is amazing.

Andre

#8 BYoesle

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Posted 09 January 2013 - 03:25 PM

Great image Andy - very detailed! :waytogo:

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.

#9 Andy Devey

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Posted 09 January 2013 - 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

#10 BYoesle

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Posted 09 January 2013 - 06:39 PM

Whoa! :bow:

#11 etalon

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Posted 09 January 2013 - 06:47 PM

Hi @ all,

I am new at cloudy nights and say hello to all :wavey:

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-...tempt1snew2.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

#12 Andy Devey

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Posted 09 January 2013 - 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

#13 etalon

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Posted 09 January 2013 - 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

#14 Jim Chung

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Posted 09 January 2013 - 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

#15 genethethird

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Posted 09 January 2013 - 11:03 PM

Hellllo new desktop! Nice work.

#16 astrovale

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Posted 10 January 2013 - 11:25 AM

WOW Andy! Fantastic job: congrats!

Luca

#17 Andy Devey

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Posted 10 January 2013 - 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

#18 raylal

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Posted 10 January 2013 - 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

#19 etalon

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Posted 11 January 2013 - 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:

It´s 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 it´s cloudy since weeks and if it´s clear, I´ve terrible seeing. So, please show us more of your detailed pics!

Best,

Markus

(sorry for my bad english...)

#20 Aquarist

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Posted 11 January 2013 - 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.

#21 Andy Devey

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Posted 14 January 2013 - 08:36 AM

Hi Markus

Thanks for your excellent input, I have just found an excellent online tutorial for full disc processing by Ken Crawford that is very useful he is an expert in Photoshop.

Regards

Andy

Ken Crawford tutorial






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