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Image Problem

 
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RobbieC



Joined: 06 May 2017
Posts: 8
Location: Sonoma CA

PostPosted: Sat Jul 01, 2017 5:06 pm    Post subject: Image Problem Reply with quote

Any thoughts regarding the horizontal banding at the right edge of this image. Stacked with both Helicon and Zerene. Same result 5X Nikon Toolmaker objective 120 images.
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ChrisR
Site Admin


Joined: 14 Mar 2009
Posts: 7257
Location: Near London, UK

PostPosted: Sat Jul 01, 2017 5:25 pm    Post subject: Reply with quote

Welcome to the Forum Robbie.

Those streaks are benign!
This should explain all:
https://www.zerenesystems.com/cms/stacker/docs/faqlist#my_output_image_has_a_band_of_streaks_on_one_side_why_is_that

In case you were wondering, Rik Littlefield who is the main administrator of the forum, wrote Zerene Stacker.

The dark wiggles running 8 o'clock to 2 o'clock, are sensor dust.
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Chris R


Last edited by ChrisR on Sun Jul 02, 2017 1:58 am; edited 1 time in total
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RobbieC



Joined: 06 May 2017
Posts: 8
Location: Sonoma CA

PostPosted: Sat Jul 01, 2017 9:09 pm    Post subject: Image Question Reply with quote

Chris,

Thanks for the welcome and the information. I am sure this won't be my last question.

Robbie
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ChrisR
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Joined: 14 Mar 2009
Posts: 7257
Location: Near London, UK

PostPosted: Sun Jul 02, 2017 2:01 am    Post subject: Reply with quote

You're very welcome!
Apologies for misspelling your name.
This sort of subject is usually best dealt with in "Macro and Micro Technique and Technical Discussions", we'll move it there after you've had a chance to see.
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Chris R
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RobbieC



Joined: 06 May 2017
Posts: 8
Location: Sonoma CA

PostPosted: Tue Jul 04, 2017 11:02 am    Post subject: New Image Reply with quote

What could be causing the "ghosting" near the edge of the most superior part of this image? 10X, 250 images.
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rjlittlefield
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Joined: 01 Aug 2006
Posts: 18248
Location: Richland, Washington State, USA

PostPosted: Tue Jul 04, 2017 11:10 am    Post subject: Reply with quote

Quote:
What could be causing the "ghosting" near the edge of the most superior part of this image?

Those are the remains of out-of-focus images, not completely removed by the stacking process.

The problem is that focus-stacking software is in the business of retaining detail, but in uniform background there is no real detail, only the false detail provided by the edges of blur circles.

In Zerene Stacker, this issue can be addressed by using DMap and adjusting the contrast threshold slider so that troublesome parts of the background go "black in preview". This is discussed to some extent in the How To Use DMap tutorial, and in more detail in the Advanced Retouching video tutorial, both indexed at https://www.zerenesystems.com/cms/stacker/docs/tutorials/tutorialsindex . See also http://www.photomacrography.net/forum/viewtopic.php?p=211728#211728 and the surrounding thread for a more recent discussion.

The subject that you're photographing is one of the frequent cases where the best results will come from merging DMap and PMax outputs using the retouching tool. You may also want to use retouching, perhaps combined with Stack Selected, to address the issue of "transparent foreground", which I see at the end of the antenna. This latter issue is discussed at https://www.zerenesystems.com/cms/stacker/docs/tutorials/stackselectedfortransparentforeground .

--Rik
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