Uploaded May 2023 | Updated September 2026, 1 week ago

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I've been playing around with image stacking lately, combining multiple high ISO images of the same scene into one clean, low-noise image.

Some notes:
The relationship between stacked images and the noise reduction effect seems to be squared, not doublings, so you must combine:
Four images for a one stop ISO improvement, not two.
Eight images for a two stop improvement.
16 images for a three stop improvement.

I've been using Affinity Photo 2 to do my image stacking, but I imagine there are other free and open source programs out there as well.

Happy shooting!

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kyleclements.com