The official DxO PhotoLab documentation mentions that enabling moiré patterns is necessary to achieve functionality similar to Pureraw. However, PhotoLab does not have this feature enabled by default. Why is that?
2:
Regarding purple fringing correction, I cannot locate any official documentation on this feature and am unsure whether Pureraw also enables it by default.
For these two features, I would like to inquire: Are there any drawbacks to using them? If there are no disadvantages, can they be permanently enabled by default for processing all images?
Why DxO has implemented things as they have … is irrelevant to me: They just have.
We can work around the things that seem less than logical. We’ll probably discover that nothing breaks either way. If it does, I usually create a ticket here: support.dxo.com.
To add to the list: CA corrections have been implemented with one slider set to “magic” and the other is “not magic”. When I activate “magic” for both sliders, I get cleaner edges in >95% of the images. Some need manual adjustment though. After all, there is sample variation in equipment and one lens might be at the other end of the range that was measured by DxO to create a DxO Module.
I suspect that DxO has deactivated said corrections because they might harm rather than help under certain conditions. If one never comes across these conditions, the settings might as well be set active. It’s our choice and if we have lots of purply fringed images and visible moire, leaving the things on active can make things easier.
This is correct. Moire reduction helps when there’s moire, but also reduces color fidelity when there isn’t a lot of moire to correct. Using it globally (currently the only option available) comes with tradeoffs. CA correction is usually good in moderation but can introduce unwanted artifacts when overused. And I remember DxO saying many years ago that purple fringing is deactivated by default because it isn’t reliable when there isn’t purple fringing to correct.
The current user guide for PhotoLab implies that the default automatic/magic settings for chromatic aberration correction correspond to the optical correction module for a given camera/lens combination. In summary, it seems what DxO has in mind is for us to use the corrections when they are needed and to feel free to rely on automatic corrections, but otherwise image quality could be reduced.
I don’t use PR, just PL for demosaicking. I had seen some birds photos where activating Moire corrections in PL would cause unwanted artifacts, e.g. around ducks eyes or BIF/sky boundary (e.g. yellowish casts). If it’s true that PR always does moire correction, I’m left puzzled like OP…
EDIT: To be sure, heavy moire is almost always “deadly”, whichever software you use. DeepPRIME3 sometimes helps, but no guarantee…
Sure, moiré, if captured on purpose, can’t and shouldn’t be removed because it would deny the very purpose of the shot
Removing moiré almost always comes along with less perceived sharpness. And I had seen, in PL, moiré that was caused by interference of image vs screen pixels. Luckily, this was easy to correct by changing the zoom level.
I keep moiré correction off in all apps I use and only rarely had an image that would have needed it.
