Still a week 2 noob here, but going through some old HDR work to learn Aurora HDR 2019. I had an old series of HDR images from Sebago that was interesting: Boats on a dock. Boats that move constantly even on a calm day, and thus are very difficult to deal with.
The original base images are here:
I used hugin to align the images and produce the following HDR image shown below:
I thought this was amazingly good. You can see the blur artifacts from the movement of the boats (the number 15; the motors, etc), but if you don’t look too closely this is a nice image.
Below is the attempt with Aurora HDR 2019, Version 18.104.22.1689. I imported the base images with Auto Alignment, Ghost Reduction, and Chromatic Aberration Reduction all turned on. Then I turned off all the Filters. (Meaning this is not going to be the final result.)
Obviously a fantastic job with the blurring. Amazing. I can work with this.
Except I can’t. Something is causing sharpening halos. I’ve tried turning all the filters on and off, but even with everything off, nothing eliminates those halos, afaict. So where did they come from?
Here is closeup of the problem: Look at the sides of the posts. Hugin on the left shows that it is possible to combine the images without excessive halos. Aurora on the right show unacceptable halos.
Not all my images show excessive halo. I did a series of work with a much better camera at http://www.clevercaboose.com/2019/05/07/tablerock-trip-20190414/ But now I needed to stop and figure out what is causing this.
I created a support ticket with Aurora. Quick response:
..it’s quite normal behavior of the software…the RAW photos you’ve sent to us are quite low-resolution ones, and they come out aligned pretty well considering their resolution and format. You might have achieved a better result with RAWs though. The halos you may see are not halos, but light on the photo increased by our tone-mapping powered by AI which increases the contrast.
Contrast that looks like a noob that just discovered the unsharp mask filter! I’d rather a more adult AI.
A note on the word “halo”. Specifically I am talking about overshoot and undershoot.
But perhaps the problem IS low resolution. These ARE old photos.
Try again with 2019 quality images:
Here is an HDR composite with ALL Aurora filters turned off.
The light on the horizon IS “haloed”, excuse me, AI-powered contrasting. But there is also contrast from the original images. Has Aurora added to this even with all filters turned off? Below is an area on the horizon zoomed in:
If there is any halo,. it is present in the originals as well. I have no cause for complaint. Aurora is excused.
Caveat: Play around with the filters (in particular the “HDR Smart Structure”) and you will find many ways to create crappy sharpening. So don’t turn the knob to 11.
So the issue is resolved. But be careful working with low resolution images. The AI isn’t very smart all the time.
Update 6/1/2019: Here is an extreme example with hi-rez images. Base images first. This is 9 images with 1EV bracketing
And here is an HDR of all 9 images. I aligned the images (this was hand-held), did no ghosting, and selected the “essential/vivid” template.
Below is the same 9-image HDR with all the same settings EXCEPT medium ghost reduction is turned on. And here we see the problem: That is the worst halo I have ever seen.
Previously I was frustrated because I could not find a setting to turn off whatever was causing the halo. Now it is clear why: That halo is baked in when the image is created.