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Zerene: sort by scale

 
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Adalbert



Joined: 30 Nov 2015
Posts: 258

PostPosted: Sat Nov 25, 2017 12:06 pm    Post subject: Zerene: sort by scale Reply with quote

Hello everyone,
Does anybody know, when is it recommended to use “sort by scale”?
BR, ADi
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rjlittlefield
Site Admin


Joined: 01 Aug 2006
Posts: 18244
Location: Richland, Washington State, USA

PostPosted: Sat Nov 25, 2017 2:44 pm    Post subject: Reply with quote

Sort by scale can be helpful when images were originally shot out of order, particularly when you want to stack using DMap.

The idea is that images can usually be aligned even if they are out of order, and the resulting scale as determined by the alignment process makes a good proxy for focus distance. The workflow is align, sort by scale, then re-align and stack.

The success of this approach depends to some extent on the exact lens setup that was used when the stack was shot, as well as whether focus was stepped "by ring" or "by rail". But it does work well in many cases, and when it does work, it's a lot simpler than rearranging the images into focus order by hand.

Sort by scale will not help with stacks that are known to have been shot in focus order. It can even mess things up, particularly at high magnification where there is not much actual change in scale with focus.

--Rik
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Adalbert



Joined: 30 Nov 2015
Posts: 258

PostPosted: Sat Nov 25, 2017 3:57 pm    Post subject: Reply with quote

Hello Rik,
Quote:
“ then re-align and stack”

Do you mean “Align & Stack All (*)” ?
BR, ADi
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rjlittlefield
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Joined: 01 Aug 2006
Posts: 18244
Location: Richland, Washington State, USA

PostPosted: Sat Nov 25, 2017 8:51 pm    Post subject: Reply with quote

Sorry, I was thinking concepts. Yes, that's the spelling in the menu system.

--Rik
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