Problem with DNG files created by DXOPureRaw when used in Affinity Photo

[Equalizer]

The DNG files created by DXOPureRaw are incorrectly interpreted in Affinity Photo. This leads to a purple discoloration in the highlights. This problem also occurs in Luminar AI. Interestingly, this bug does not occur in Luminar 4, Photolemur, Aurora HDR and Photoshop CS6. So it's a bug that only occurs in Affinity Photo (and Luminar AI). See sample images. Why is that? Please help.
I'm using the latest version of Affinity Photo and Windows 10.
 

 

 

 

 

 

[walt.farrell]

You might check the other threads dealing with DXO Pureraw and Affinity. Perhaps one of them will help:
https://forum.affinity.serif.com/index.php?/search/&q=dxo pureraw&quick=1

[Equalizer]

Many thanks for your help.  But I've already read that, but here, too, there are no solutions that help.  The problem only occurs with the DNG or jpg files generated by DXO.  For example, if I generate a DNG with the Adobe DNG Converter, there are no problems.  Lights are white.  I think that the DNG generated by DXO deviates from the norm and therefore the error occurs.  Affinity's RAW converter doesn't seem to be able to cope with this either.  Programs like Darktable, RawTherapee and Luminar AI also have the problem.  Interestingly, however, the error does not occur in Luminar 4, the predecessor of Luminar AI.  This could mean that the RAW engine has been changed in Luminar and there is an incompatibility here.  It's a shame, because I use both Affinity and Luminar and would have liked to use DXO PureRaw as a preparation for my RAW development.

[Max P]

Hi

 

     I'm just trying with the Dng

  view the dng found in the link  ( the pink area corresponds to an overexposure, as an indication ). 

   Okay,  I have DXO photo lab 4.3.1, minor coorection on the raw sony A1,  no Pureraw .

  you should report this fact on the DXO forum and support

 

 

[walt.farrell]

14 hours ago, Equalizer said:

Affinity's RAW converter doesn't seem to be able to cope with this either.  Programs like Darktable, RawTherapee and Luminar AI also have the problem.

As there are several affected programs, I would suggest that the issue might be in DXO and you should report it to them.

[Equalizer]

First of all, thank you very much for all the advice. I tried around a lot myself.

I agree that there is a problem with the DNG file created by DXO. This is a linear DNG in which the Bayer interpolation, application of the lens profiles, noise reduction and sharpening have already been carried out and noted in the DNG file. The other areas such as brightness, colors, white balance etc. have not yet been changed and are fully available for editing.

And this is where the DNG file generated by DXO differs from a DNG file generated by the Adobe DNG Converter. In this case only the Bayer interpolation is carried out. The rest stays as it is. It is not a linear DNG. And then when I open this DNG file in Affinity Photo (or Luminar AI, which I also use) there are no purple spots in the burned out lights.

I conclude that the DNG file generated by DXO does not adhere to the DNG conventions and, depending on the RAW converter, problems then arise.

What puzzles me is that in the predecessor of Luminar AI, namely the Luminar 4, none of these problems occur with the DNG file generated by DXO. This leads me to suspect that the RAW engine and the implementation of the recognition of a DNG file by Luminar AI is different from the RAW engine of Luminar 4. And that in turn leads me to conclude that there is also a problem with the serif RAW Engine there. If you activate the Apple Core Engine in Affinity Photo on a MAC computer, the problem does not occur.

All in all, I conclude from this that there are RAW converters that don't quite get along with the DNG file that DXO generates, because it deviates from the conventions of a DNG file. This currently applies to the RAW Engine from Affinity Photo (Serif RAW Engine), Luminar AI, RawTherapee and Darktable. The RAW engines of Adobe Photoshop, Luminar 4, Photolemur, Aurora HDR 2019 and Apple Core Engine have no problems.

I have already reported the problem to DXO (so far without feedback) and Skylum (Luminar). The people from Skylum now want to take a close look at my DNG files.

[PetervL]

Thank you for your research. To me it makes sense. Much appreciated.

Peter

[MEB]

Hi @Equalizer,
This is something we are already aware of/logged with the devs.
Do you mind attaching the DNG file generated by DxO PureRAW shown in your first post please?
Thanks for your report/feedback.