NikonGear'23

Gear Talk => Processing & Publication => Topic started by: Michael Erlewine on May 21, 2020, 03:45:28

Title: Stacking Problem
Post by: Michael Erlewine on May 21, 2020, 03:45:28

When I stack layers of an image, I frequently get what you see along the bottom of this photo. Sometimes it is on the bottom and a side as well.

Anyone know what causes this. Using the Nikon Z7, any lens, and stacking.

Title: Re: Stacking Problem
Post by: bobfriedman on May 21, 2020, 14:18:53

you need to crop that portion.. it is due to frame image size reduction from the first or last image, check them and you will see that the focus extent was so great as to reduce the image frame on the final image.

how many layers did you use on this one?

Title: Re: Stacking Problem
Post by: rosko on May 21, 2020, 15:36:30

I got the same issue recently on this image : https://nikongear.net/revival/index.php?topic=9459.0

However, I got this issue on top instead the bottom. (with combine ZP).

I just cropped it.

I have no idea why that happened.

Francis.

Title: Re: Stacking Problem
Post by: Michael Erlewine on May 21, 2020, 16:22:59

Well , yeah. I also crop it, but wonder how to avoid. It can happen with a small or large stack.

Title: Re: Stacking Problem
Post by: Birna Rørslett on May 21, 2020, 16:25:44

The framing varies between the individual images. The stacking software uses normally the first, or last, frame in the stack to align the remainder.

You might occasionally have an unintended composition shift in the first few frames. If so, deleting these from the stack helps.

Title: Re: Stacking Problem
Post by: Michael Erlewine on May 21, 2020, 23:54:23

Thanks all. I will look into how much I try to capture from first to last. I might be better to two batches and then combine the two results. Make any sense?


Here is one that was more limited and worked out...using the Nikon  Repro f/2.8 100mm

Title: Re: Stacking Problem
Post by: bobfriedman on June 06, 2020, 21:21:20

you also might try reversing the order... or removing an image that is possibly not consecutive..

Title: Re: Stacking Problem
Post by: Birna Rørslett on June 06, 2020, 22:27:47

I found that some challenging stacks can be brought under control by doing separate stacking of small subsets, then input these in an iterative fashion to get the final image.

Title: Re: Stacking Problem
Post by: bobfriedman on June 07, 2020, 00:04:50

Quote from: Birna Rørslett on June 06, 2020, 22:27:47

I found that some challenging stacks can be brought under control by doing separate stacking of small subsets, then input these in an iterative fashion to get the final image.

true.. called "slabbing" by some.. Rik Littlefield has a "slabbing" function in ZereneStacker