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Beep6581 / RawTherapee

A powerful cross-platform raw photo processing program
https://rawtherapee.com
GNU General Public License v3.0
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Noise reduction preview differs from exported file #5608

Open blitzgneisserin opened 4 years ago

blitzgneisserin commented 4 years ago

Apparently there is more noise in the 100% preview than in the exported file. I have tested this with several photos, in certain photos it is very pronounced. In other photos it is barely visible.

To reproduce:

  1. Open a raw with a lot of noise.
  2. Apply noise reduction. Set Gamma to a low value, e.g. 1 or 1.2, set luma noise reduction to a moderately high value, e.g. 25-50, set recover details to a high value, e.g. 80
  3. export the photo
  4. compare the results

Screenshots:

screenshot_rt_noise_ff screenshot_rt_noise_rt

Here is the link to the raw + sidecare file. https://drive.google.com/open?id=10z5Cgn9V6tZPgs7I15wcX1h7Ft__dt9C

RT development build 13 January 2020 + RT 5.7 from Debian repo OS Debian Bullseye screen: BenQ SW240 (110% AdobeRGB, hardware calibrated+profiled)

Thanatomanic commented 4 years ago

I can confirm. First, RT 200% view of my edit (Neutral + Exposure + some NR)

image

Then the export, enlarged to 200%, same area: image

Thanatomanic commented 4 years ago

In addition: even without touching the gamma slider, there is a noticeable difference in the 100% preview and the export. For good measure I exported to png to avoid jpeg artifacts.

Possibly related: #4773

heckflosse commented 4 years ago

Does it also happen when luma noise reduction is set to zero?

Thanatomanic commented 4 years ago

No, I don't think so. The output seems identical with the preview in that case.

blitzgneisserin commented 4 years ago

Possibly related: #4773

I have seen that too, though it seemed to me that the report was not clear enough. And it was reported some time ago...