Photographing Milky Way photos with low noise
How do we create low-noise foregrounds in Milky Way images?
Blending the Milky Way with the low-noise foreground: method one
Above is a photo of my low-ISO “blue hour” photo. I brought this in as a layer over the top of the background layer. Then I made two copies of this above for a total of four layers, three of them identical.
Creating a stark black and white image
Going black and white
Paint it black
Above: the mountains had snow on them, so they did not turn dark. However, they are part of the foreground. Black paint brush to the rescue. I painted the mountains black as well.
Above: I continued the process of painting everything black. Here, the brush is larger because I have already painted the detail-oriented parts by the trees and mountains.
Above: almost done!
Creating a mask
Above: As you can see from the Layer Section inserted here, I began creating the mask. Here’s how I did it.
1. I copied the entire black and white layer that you have just created. I am on a Mac, so I use “Command A” to select everything, creating the “marching ants” on the periphery, and then “Command C” fo copying the selection.
2. Then I clicked on the layer just below the black and white layer. I created a Layer Mask (“Layer” > “Layer Mask” > “Reveal All”), and then clicked on the new Layer Mask to select it.
3. I hit “Alt-Click” to bring the Layer Mask up on the main screen. Then I selected everything (“Command A”) so that the “marching ants” were again surrounding the image. Then I pasted (“Command V”). This made the mask look identical to the layer above. But wait…I had one more tiny step!
4. I inverted the mask by hitting “Command I”. The black and white parts traded places. All was good.
I no longer needed that top layer. I could delete it since I had my Layer Mask.
Bringing it together
Above: this image shows what my high-ISO sky looked like with my “blue hour” foreground.
Now, obviously, you can tell they were taken at different times. From here, I would need to process both the foreground and the sky to make them look more cohesive and natural. How you do that is up to you. I find that this can differ dramatically from photo to photo.
I processed the sky separately initially, creating more of a blue sky and bringing out the detail of the stars. I also decided to have more of a blue with the foreground as well. Then I began processing them together to have them “gel” more together, eventually ending up with the final photo.
The importance of increasing contrast and brightness
I began greatly increasing the contrast and brightness to create masks after I had begun attempting to use Luminar 4’s AI Sky Replacement Algorithm and seeing that it worked better if I did so while also experimenting on creating Layer Masks in Photoshop. However, after watching a very useful YouTube tutorial by Michigan Milkyway entitled “Tree masking for tracked night sky images in Photoshop”, I realized that I had to boost the contrast and brightness far more than what I was doing for either method.
Blending the Milky Way with the low-noise foreground: method two
I promised that I would show you two methods. This other method simply uses Luminar 4’s AI Sky Replacement. This works magically well with day photos and reasonably bright blue hour photos. However, its algorithms struggle with night sky photos unless you treat them beforehand by greatly boosting the contrast and brightness or exposing greatly to the right in the first place.
Above: in Luminar 4, I opened up the photo of the “blue hour” foreground and opened “AI Sky Replacement”.
Above: in AI Sky Replacement, I loaded a custom sky, which of course was my own high-ISO sky. After that, I adjusted the “Horizon Position” slider so I could actually see the Milky Way sky, and then made several other adjustments to create a good, seamless mask and create various aesthetic adjustments. This process took less than a minute.
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