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Nope! That’s entirely normal. Stacking in astronomy doesn’t really change the image size because the image still has the same number of pixels.
Where the size will change is going from a 12-14 bit raw file (NEF of CR2 with Nikon/ Canon) to a 16/32 bit FITS or TIF.
What stacking does is average out each pixels brightness so get it closer to its true value but as the number of pixels doesn’t change, the image size doesn’t either.
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