About Thomas Fitzgerald

Thomas is a professional fine art photographer and writer specialising in photography related instructional books as well as travel writing and street photography. 

Tips on Tricky Sky Replacements with Luminar & Photoshop

Tips on Tricky Sky Replacements with Luminar & Photoshop

Luminar’s best known party trick is its AI Sky Replacement, whether you love it or hate it, but it occasionally doesn’t work properly. I was recently playing around with an image from my archive, and I came across such a situation. Here’s the method I used to get around the problem.

I started with a photo I took in Washington DC many years ago. I was under some trees and in the distance was the Washington monument. It was an ok image, but it was a bit bland. I thought I would try it in Luminar to see if I could make anything out of it, and so, the obvious thing to try was replacing the sky, as its blandness is the most distracting thing. Also, the lighting was pretty bland too.

Here is the original image before any editing

The first thing I did was open the image in Photoshop. I almost always use photoshop as a host when working with Luminar. The reason for this will become clear a little later in this post, but the first thing I did was duplicate the layer and convert the new layer in Photoshop into a smart object, and then run Luminar as a filter on that smart object. This keeps the layer non destructive (and I like to have the base layer as the original).

I started by using the AI Enhance filter a little, as I find that it sometimes gives nice results. Then I tried replacing the sky. On the first try, it replaced the sky perfectly, but half the monument was missing. Which obviously is no good. I played around with the settings, but when I managed to get it so that the monument was covered, the trees had big gaps in the replacement. So, after a while trying various options, I set it to cover the monument and clicked apply to send it back to photoshop.

Here, the mask is ok on the monument, but there are issues with the trees

This is where having it in Photoshop pays off. I duplicated the smart object. Then, because the settings for Luminar are on a smart layer, I just ran the filter again, and it came back up with all the settings I had previously set. I could now tweak them until the trees were correct, but the monument was half replaced. I clicked apply to render this back out, and once back in Photoshop, I just used Photoshop’s mask tools to mask off the monument revealing the layer underneath, where the monument was correct.

Here, the trees are ok, but the side of the monument is keyed out.

Photoshop Layers

Photoshop Layers

If you’re wondering why I didn’t just use a mask on the Sky Replacement tool in Luminar, it’s because that would have masked the relighting too, and that was an important part of the image. There may well have been a way to do this by some combination of stamped layers, but in my opinion it was just as easy to do it in Photoshop. The other advantage of this is that the layers are kept non-destructive, and I can go back in at any time ad do some further tweaks.

I did some additional tweaks back in Photoshop, with a few adjustment layers. Finally I sent the image back to Capture One (as this is where it had started) and I applied one of my own styles from my T-NEG collection. This just tied everything together. Without this, it still looks a little fake, but covering it with a mild film effect and a little grading makes it look more realistic. This is a technique that I often used when working in Visual Effects over the years. After you do a composite, you often do some grading or film grain on the final comp as it just helps tie everything together, and this works with still images too.

Final Composite in Photoshop. It still looks a little fake (around the trees in particular)

With a little grading and Grain in Capture One, the compositing is less obvious.

One other lesson to take away from this, apart from the compositing tips, is that you shouldn’t be afraid to use multiple tools to do a job. I regularly get comments from people asking “why didn’t you just use x software” or from people who think its somehow hearsay if any particular application can’t do everything on its own. But in the professional space, people will use whatever they need to get the job done. While, I understand that not everyone has lots of software, and that’s fair enough, but if you do, you shouldn’t be afraid, or have some ideological hang-up about using multiple applications.

For example, I probably could have done all of this in Luminar, but it would have required a lot of roundabout thinking, and making stamped layers and so on, but for me this was much easier to do this in Photoshop and Luminar together. Similarly, I could have gone from Capture One straight to Luminar, but then I wouldn’t have had the flexibility of Photoshop. This might seem obvious to some, but its actually the most common comment I get when I post tutorials where I use more than one application.


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