The picture of the export looks different to the pictute in darktable with colors.
Same in jpg or tif. I am using Version 4. But not at all pictures.
I reset the picture and setup it again, same result.
Some modules need 1:1 preview to reflect actual export. There may be bugs – we’ve had trouble with haze removal, for example. The preview may also show scaling artefacts that are, thankfully, not present in the output.
Without knowing your settings, how you export (full size or scaled, and, if scaled, with high-quality resampling enabled or disabled), it’s hard to tell. If possible, please provide an input image + XMP sidecar that demonstrate the issue; possibly also screenshots.
Hi
thanks for answer.
Here I saved the data
https://drive.google.com/drive/folders/145CTWl8HxuQODsE1Xe0V-Ch8Qz0sqGnQ?usp=sharing
Regards Volker
Hi
thanks for answer.
Here I saved the data
https://drive.google.com/drive/folders/145CTWl8HxuQODsE1Xe0V-Ch8Qz0sqGnQ?usp=sharing
Regards Volker
I’ll have a look later. You can actually upload files here (even big raw files), but maybe that’s not allowed, if you’re a new user.
Do you have access to the data
I was able to open Google Drive, yes.
Yes, it’s haze removal. See, for example, https://github.com/darktable-org/darktable/issues/10283.
The hack is to export it scaled by 0.99. 
Get rid of that broken module, and use diffuse or sharpen with the dehaze preset.
color contrast is no longer recommended (try color balance rgb), I think, and diffuse or sharpen with the sharpen demosaicing presets will give you very good results instead.
Moinchen, Volker & welcome!
Interesting effect :-)))
@kofa I believe I have found a way to reproduce the effect Volker has discovered:
a) Open the Funkturm, and decrease the size of darktable. Now the two images on the screen (the one in the navigator and the one in the main window) look relatively equal:
b) Do not change any settings - just maximize darktable. Now most of the red tones in the sky disappear from the main image window (but they seem OK in the navigator window).
MfG
Claes in Lund, Schweden
This may be similar to what I saw with the sunflower example. It seems that the Darkroom preview is not matching the Lighttable one…I cycled through all the settings in the lighttable and was not able to isolate them…I might be missing somethings but the results were about the same as what @kofa mentioned with is export experiment?? So maybe the navigation preview as well??
We don’t have any bright, extremely saturated colours here. I’m pretty sure it’s a bug in haze removal.
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I find out if you crop the picture a little before export in crop modul it seems to work
but the haze removal is nessesary I need it all the time
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I do underwater images and the haze removal is a godsend for these. I will compare the diffuse and sharpen option, but is the ‘known’ issue of haze removal filed as a bug report by someone with samples?
try a tone curve…start strait and blend in subtract… low opacity…give a nice saturation bump and dehaze like effect…can also alter the curve to tweak it
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Thanks for the suggestion. I am always looking for new and improved ways to tackle problems in DT. Dehaze has worked nice with my underwater images. Sometimes I apply a gradient filter to the module as haze varies obviously with the distance underwater. I probably tackle terrestrial haze in different ways to underwater since haze is a natural part of landscape images. Usually some levels adjustments works fine for me.
I don’t know if its any improvement but in the past I used this with slightly faded old jpg files from the past… I found often that was all that was needed to bring them to life… I think my preset is at 15 percent and I usually use it between 10 and 30 and for some reason I prefer the look given in the tone curve module over the rgb curve module… 
there I go breaking the rules