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4.1.2 Stacking Image Sequence – Noise Stacking

The stacking image sequence feature is based on the so-called Signal to Noise Ratio
(SNR).

Here a sequence of images of a subject, taken with the most similar conditions as
possible, are assembled as one image with reduced noise.

The image noise is reduced by the ration 1:“Root of the number of photos”.
For example, if you take a photo with an ISO 12800, you can expect a high amount of
noise.

Using a tripod, consecutively take the same shot 4x and lay them one on top of the other
with image sequence stacking. You will obtain an image with 1:”the root of 4” = 1:2, i.e.
half of the original noise.

You can reduce this noise further with more photos. With 100 shots, your image at
12800 would only have 1/10 (one tenth) of the initial noise.

The following comparison is a practical example of stacking 10 images:

Single image Noise stacking with 10 images

The image sequence stacking function stacks three different types of images on the same
spot: light frames, dark frames and flat frames.

Further information on these topics can be found in the chapter 4.3.7 Correction
Images.

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