EXCERPT page containing first few paragraphs. 2022-01-25 12:34:53
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To produce an mRAW or sRAW image, the camera first crops the 8688 X 5792 image size to 8640 X 5760, which is exactly 4/3 the dimensions of mRAW, and 2X the dimensions of sRAW.
The scaling from full resolution is thus 3:4 and 1:2 to produce the two smaller raw sizes (after the minor crop), and thus the mRAW and sRAW formats are slightly cropped from full frame.
RAW: 8688 X 5792, 50.32 MP ==> 8640 X 5760
mRAW: 6480 X 4320, 27.99 MP
sRAW: 4320 X 2880, 12.40 MP
Observe that the mRAW and sRAW file sizes are highly inefficient if the goal is saving space. These numbers will vary with each particular image (its compressibility)*.
• sRAW is 51% the size of raw, but has only 1/4 as many pixels*!
• mRAW is 75% the size of raw, but has only 56% as many pixels.
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