[Digikam-devel] [Bug 257737] Fuji S3 Pro Raw files (RAF) only S pixels are processed giving 6MP Should be S+R Pixels giving 12MP

[Alex Tutubalin]

https://bugs.kde.org/show_bug.cgi?id=257737





--- Comment #8 from Alex Tutubalin <lexa lexa ru>  2011-11-05 08:00:28 ---
Please note, that S3Pro files have 2:1 aspect ratio, not usual 1:1
 The RAW data size (single pixel set) is 4352:1440 (i.e. 3:1 after removing
masked pixels: 64 pixels in X direction and 4 pixels in Y), while output is 3:2

So, there are two possible ways to scale the image
 1) Scale Y direction 2x, so result will become 4300x2880 (~12Mpix)
 2) Scale Y 1.4x and scale X ~0.7x, so result will become 3030x2036 (as LibRaw
does)

The first method is way too optimistic: the low-sensitivity pixels are 3 stop
less sensitive, so midtones are way underexposed for this pixel set. As a
result, low sensitivity part of sensor will be unable to add much for mid-tones
resolution.

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