remapping and blending issues

[Matija Kogoj]

I am getting strange results when trying to output an .exr panorama, and I was hoping someone could tell me what I am doing wrong.

Windows 7, 64bit, 16GB RAM

Intel i5 CPU

Nvidia Quadro graphics

Aside from the masked area at the bottom of the composite, the panorama always has some sort of mapping or blending problem. I don't know how to  describe it, so it is best if I show you. Dropbox link is at the bottom.

It was taken with a modified (APS-C intended) 8mm samyang on a full frame camera, meaning it is like a circular fisheye, but the top and bottom of any image are cut off, and the circular crop marks extend over the edge. Actual view angle is about 180°.

When using the advanced or expert interfaces with control points alone I couldn't get the sky (which, as you will see, is a single piece right to the ground) to project properly. I finally managed to do so by dragging it in the simple interface and pressing align, but that cause its own share of artefacts - from ghosting to what looked like a diminished dynamic range at the highlights (speaking only innear the sun area).

I don't know what else to do, and have not found anything relating to these issues in the documentation.

At the link you will find a zip file with the panorama in question, the save file, result...

https://www.dropbox.com/s/enq5j06uq9vza1y/hugin_20180730_360.zip?dl=0

Any help appreciated.

[Greg 'groggy' Lehey]

On Friday, 3 August 2018 at 18:01:53 -0700, Matija Kogoj wrote:
> ...

>
> I don't know what else to do, and have not found anything relating to these
> issues in the documentation.
>
> At the link you will find a zip file with the panorama in question, the
> save file, result...
> https://www.dropbox.com/s/enq5j06uq9vza1y/hugin_20180730_360.zip?dl=0

This doesn't appear to be a ZIP file, despite the URL. How can I
access the file without having to mess with Dropbox?

Greg
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[Markku Kolkka]

Greg 'groggy' Lehey kirjoitti 4.8.2018 klo 4.32:
>
>> https://www.dropbox.com/s/enq5j06uq9vza1y/hugin_20180730_360.zip?dl=0
>
> This doesn't appear to be a ZIP file, despite the URL. How can I
> access the file without having to mess with Dropbox?

It's a normal zip file. Click the "Download" button on the top right
corner and choose "Direct Download". If you get a dialog box asking you
to register to Dropbox, click on the line at the bottom that says
something like "No thanks, just download the file". If you allow cookies
from Dropbox.com your choice will be remembered and future downloads
will start without requests to register.

[T. Modes]

Am Samstag, 4. August 2018 03:01:53 UTC+2 schrieb Matija Kogoj:

I am getting strange results when trying to output an .exr panorama, and I was hoping someone could tell me what I am doing wrong.

You have overlapping positive masks in images 10 and 20. This will result in some undefined behavior during remapping and enblend will struggle during the blending stage.

Second, the exposure values vary from stack to stack: The exposure time is 1/5 - 1/200 s in each stack, but the ISO varies between 100 and 800. I'm not sure if this results in some problems.

[T. Modes]

Am Sonntag, 5. August 2018 10:19:18 UTC+2 schrieb T. Modes:

Second, the exposure values vary from stack to stack: The exposure time is 1/5 - 1/200 s in each stack, but the ISO varies between 100 and 800. I'm not sure if this results in some problems.

Maybe to minimize this issue include also the exposure values in the photometric optimizer run (use the LDR setting, not HDR one).