![]() As you can see, the original images showed a greater deal of noise (grain) than the stacked one. The image below shows a real-life example from stacking 30 images from my Sony RX10 bridge camera taken at ISO 6400. ISO noise and Luminance noise and Chrominance noise are examples of digital noises that are random. If the considered digital noise affects the pixel values randomly across the stack, then the result of averaging the stack is that the random component of the noise to the pixel value is significantly reduced. 12 images with low signal to noise are stacked and averaged to produce a cleaner and more detailed image. The scheme below illustrates the concept. The result is a single image with improved signal to noise ratio, i.e., with better details and lower (random) digital noise and better details. In the simplest form of image stacking, the pixels values for all images in the stack are averaged to produce a single image.
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