Luminar 4 - Sky Replacement Artifacts
Answered
I have noticed that when using the AI Sky Replacement that at when viewing the edited image in Photoshop 2020 at 250% and above artifacts become apparent. These artifacts are not visible in the original image nor in a version of the original image exported from LR4 and viewed in PS 2020. Also I see "halos" where the new sky adjoins bright objects in the original image. I cannot determine what is causing the artifacts and "halos" to appear but it is obviously a problem with the Sky Replacement. Whilst the artifacts are not really noticeable when the image is viewed at 100% or below the "Halos" are.
Of course for preparing images for competition the "stock" skies cannot be used but the problem is there whether the skies used are "custom" or "stock" and consequently the final image wold not be up to the best competition standard.
It would be helpful if other users could let me know if they see the same phenomenon and then I can decide whether or not to report a bug to Skylum.
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Official comment
Hi Everyone,
Please, reach us via https://skylum.com/support ad send the original images via DropBox or Googledrive so we could look deeper into the issue.
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I have just done some further research using several other images on 2 different Macs. The artifacts seem to be very much more noticeable on images taken on an Olympus TG5 (which as a quite small 1/2/3rds compact camera sized sensor) than they are on those taken on a Panasonic G6 or an Olympus OMD EM 1 Mk 2 both of which have identical 4/3rds sized sensor albeit that the Olympus OMD EM 1 Mk 2 has a much higher resolution one.
Consequently I have now come to the tentative conclusion that the quality of the original image and the replacement sky images are of prime importance. It is not only advantageous to have both the original image and the replacement sky image the same size, but ideally they also need to have been taken on cameras with identical or very similar resolution sensors.
However the "halo" effect does exist whatever image size/camera sensor size combination is used even though it is much improved with very high quality images and using the AI Sky Replacement does, in all cases, degrade the image slightly.
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Hi Greg,
Please provide us with both the original image and your sky texture sample via https://skylum.com/support.
@Christopher, as far as I can see, some additional info is required, so please follow-up with our team.
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Rene
I regret to say that, despite having some very nice features, I finally gave up on Luminar/Skylum because of their inability or unwillingness to effectively resolve bugs and glitches. I decided they had had more than enough of my money and that there were better programs such as Affinity which served my purpose equally well.
Sorry that I cannot help you further.
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