PhotoLab and moiré reduction

Hi All,

I do not know if I am using PhotoLab in a wrong way, but I find that PhotoLab is very bad at moiré reduction.
I enable the function at different level, even at 100%, but the result is very bad.
When I process the same photo in other softwares, the result is much much better, and most of the time, the moiré is completely removed.
→ is there any chance that the moiré reduction will be improved in a future version of PhotoLab?

Thank you

Michel

Only DxO can answer your question about whether or not Moiré reduction will be improved in the future and DxO will not respond to that question either on this forum or anywhere, since they never give any indication of their roadmap.

Meanwhile, can you upload an example image that illustrates your problem? If so, someone here (a fellow user) may be able to help you.

Can you post a raw sample of what you are working with? To take a look.

yes sure.
My camera is a Canon R5.
I compared DxO PhotoLab 7.8.0 with Canon DPP 4.18.10.
I have the same issue on many other examples than this one.


Photos at zoom 1:1

Ok. I was hoping you would share a raw file so rest of us can give it a try.

Well, that’s only one type of moire and imho DPP version is also unusable. There are infinitely many types of moire patterns and moire reduction tools (including e.g. LR Enhance RAW details) effectiveness varies greatly depending on the actual photo. You can find photos which “prove” that software A is better than B, and photos to prove the opposite statement. For example, Nikon NX Studio demosaicking in some cases may remove the moire even with disabled moire correction, while in other cases it is worse than PhotoLab. Personally I throw out photos with moire (unless it is easily fixed) and chose another, which taken at very slightly different angle or distance have no visible moire. You just have to be aware when moire may happen and take spare shots. Fashion, bird, wedding photographers, they all have to deal with moire, especially using recent high resolution sensors with weak anti-aliasing filters. Some cameras tend to produce moire much more often than others. You can check dpreview studio samples to see some extreme cases in parts of the scene, e.g. the litography.

Apart from the Moire tool, the following may sometimes help but may be useless for other photos:

  • Try different denoising settings, including DP ‘Force details’, HQ ‘Maze’.
  • Check Distortion
  • Check Lens Softness
  • Check CA

I don’t have too much hope it helps :frowning:

Professionals do sometime not have choice of their subject but must have results.
I’m not sure angle would make a difference on this material (distance maybe).

I don’t think so neither. I had images not suitable for photolab because of moire when other demosaicers did the job.

I’ve demonstrated to DxO that the demosaic method has a huge impact on moire and mazing artifacts. DxO’s method is inferior to amaze, for example. If I could have just one request for PhotoLab, it’s that DxO improve its demosaicing.

I agree with you JoPoV.
I showed and gave facts, not opinion.
It is a pity for me that PhotoLab is so weak at processing correctly moiré.
Nothing is perfect…

I have very big doubts about this moiré “problem”!

As I understand the photo shown above, I am not at all convinced that this is poor processing by PhotoLab!
You will have to have the original raw to be absolutely sure, but I have the impression that it is not a moiré due to the sensor, but “natural” moiré resulting from two layers of fabric superimposed!
If this is indeed the case, there is absolutely no reason for PhotoLab to correct this moiré during demosaicing. I would even say that only PL treats this moiré correctly by respecting it!

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