Correction of heavy noise?

[mkogoj...@gmail.com]

Hello.

I have noticed a few times already that some of the resulting images have very high noise. In this case the red channel is going crazy - there are small pink dots all over the scene, that are not present in the original files.

https://pasteall.org/pic/1563c8e25b3f423fb6942064187b7dbb  

Of course brightening the originals would bring out noise like this, but even then there would be less of it. Moreover, to my understanding once the hdr is brightened it should (at most) correspond to the image that was taken at that exposure level.

Any hint into how this happens, and how to fix it?

https://pasteall.org/pic/1563c8e25b3f423fb6942064187b7dbb

[Luís Henrique Camargo Quiroz]

   Hi Mathias (if I recall well)

   I had problems like you long ago, with lots of messages about problems along the processing of the panorama. It turned out that using "--blend-colorspace=IDENTITY" for enblend and enfuse solved the issue. Have you already used this parameter?

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Luis Henrique Camargo Quiroz
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[mkogoj...@gmail.com]

Yes, something like that... then again I'm sure my name should be written somewhere, but that is besides the point.

There really aren't any error messages popping up. I have tried the command now and the result is nearly identical. I say nearly because there might be differences I can't see, but from what I can tell noise is equal.

Did you find out what was causing the noise in your case? In my case I am guessing it has to do with badly aligned images - the camera stand was swaying. I usually merge stacks to hdr in a different program because of this, but in this case the images must be aligned before merging and Hugin is the only one that I have alignment control over.

[dkloi]

It's caused by enblend/enfuse. I've tried to figure out what conditions causes it but never really found anything definitive. I just use the previously suggested setting, "--blend-colorspace=IDENTITY" (used to use "--no-ciecam" before they changed the options) to prevent it happening.

[mkogoj...@gmail.com]

It seems like the noise might not be due to enfuse.

If I merge CR2 in Picturenaut directly the exr output has a strange color cast in gradients, but merging otherwise smooth tiff files results in severe noise in the hdr.

see https://pasteall.org/pic/b65860164a844ca38d0c114070029f5a

The left image is made of tiffs from darktable/rawtherapee, the right one is using original CR2 files.

I'm currently trying to do everythingin hugin, but that usuallyfails. It might be due to highlight reconstruction in rawtherapee, but darktable results with the same issue.

Is this the same issue you (or others) solved with colorspace flag?