Nona is producing strange colors

[chaosjug]

Hi,

I'm getting strange color distortions while stiching a panorama.
This seems to be happening at the first step already. I have attached two
images. a
A part of the original jpeg and the corresponding part of the tif produced by
hugin if "Remapped Images: No exposure correction, low dynamic range" is
selected. Admittedly the original isn't great but I would have expected that
the remapped image is just a stretched version with no changes to color and
not that much worse.

Stephan

[Luís Henrique Camargo Quiroz]

  Hi Stephan!

   Once I had much worse strange color (mainly red dots if I recall well) spread across many photos. It was solved when I used enblend with --blend-colorspace=IDENTITY as parameter.

   In your second photo there are no "red wood" colors on the floor, but a darker zone at right. Is it  shadow or a problem?

   regards,

   Luís Henrique

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Luis Henrique Camargo Quiroz
http://luishcq.br.tripod.com - http://www.christusrex.org/www2/cantgreg
http://panoramaslh.net/

[chaosjug]

Hi Luís,

the issue is already appearing at the first step, where nona maps the image. At
least that is my understanding of the process. So enblend parameters won't
help me.
Maybe I wasn't clear about the images. The jpeg is the original. There is a
shadow of a chair on the right side of the image, so that is not the issue.
The tiff shows the problem. Those bright patches should not be there.

Stephan

[dkloi]

Might be useful if you could make available (e.g. dropbox or similar) an example set of images and a PTO file.  The white balances of the two files seem to be quite different. Could be something to do with colour profiles or some settings within Hugin but I don't really know.

[chaosjug]

The images are from private rooms, which I don't want to share. But I solved
it now anyway.
Part one: "Remapped Images: No exposure correction, low dynamic range" does
just what it says. It donsn't do exposure correction but it still does all the
photometric correction. I thought it would output images with only geometric
changes which kept me from looking at the obvious source for color changes:
The simple "Low dynamic range" photometric optimisation wasn't working for
those pictures. Switching to custom and adding Er and Eb did the trick.
Thanks for your patience with me!

Am Montag, 3. Januar 2022, 20:51:55 CET schrieb 'dkloi' via hugin and other
free panoramic software: