Some facts on layering or stacking image frames, a technique I have used for years when dealing with still frames from footage or to improve pixel quality and reduce noise in single images via R.B.G values (RED,BLUE, GREEN) color chanels.
Here is a video example of frame stacking, a technique I used on Curiosity Rover images of Mars last november. The technique improves clarity and has nothing to do with fakery.
Astronomers opinion on the method...
"Is it worth it to stack and process multiples vs. a single exposure?
I think so.
It’s more work, it takes more effort, but in the end the image quality you get from stacking multiple exposures can drastically improve your final product in multiple ways.
Reduce noise with reality
Stacking multiple exposures reduces noise by increasing the signal:noise ratio using reality. I like that.
But, what is signal and what is noise? It’s pretty simple — signal is the stuff (light) we want, noise is the stuff (camera sensor errata) we don’t want. One of the best benefits about stacking multiple exposures is the dramatic increase in the image quality, noise removal, by increasing your signal:noise ratio.
When you stack, you reduce the differences in the digital representation of the light that hits and excites the camera sensor. Each time you shoot an image, the electrical characteristics of the sensor cause it to do its best at representing the photons it “sees.” However, from shot to shot, there are slight brightness and color variations on each pixel for the exact same image. Image stacking produces an intelligent average of each pixel of all exposures, detail for detail, instead of trusting just one exposure and hoping it’s accurate".
https://www.ephotozine.com/article/imag ... ges--30639
"There's a technique called 'image stacking' which, if you've not heard of it before, can be used to improve resolution and detail, as well as reduced noise in your photos.
There are two reasons why you might want to do this:
1. To get a higher resolution image if you need one and your camera doesn't currently offer enough megapixels.
2. You want to take a photo with reduced noise, for example for photos of the moon, astrophotography or in low-light.
In a nutshell, the way you do this is by combining multiple images that are on individual layers in your chosen photo editing software and there are some great tutorials out there all on the subject. These include the following two tutorials by Ian Norman and Points In Focus.
The Points In Focus article looks at using Smart Objects and Mean / Medium stacking which is available in Photoshop CS6 Extended+ and CC onwards while Ian Norman shows you how to stack images using layers for a technique called 'superresolution'. Instead of using a tripod to keep your camera still when capturing multiple shots, Ian suggests you work handheld as the slight movement in-between shots give additional detail and resolution (similar to pixel-shift used in the Olympus OM-D E-M5 II and Hasselblad HS-200ms).
The 'superresolution' tutorial is a little more complicated so if you've not done this before, have a play around with smart object image stacking first, which is what we did below.
Why Should I Use Image Stacking?
The moon photo below was captured with an ultra zoom bridge camera so the result is pretty good but we had to take multiple images to ensure we captured one image that was sharp and had a reasonable amount of detail."
http://www.nightphotographyworkshop.com ... t-stackers