2016-08-17 – Nikon D3300
engine of a river boat, Kanchanaburi, Thailand
→ (youtube) Sisters of Mercy «Lucretia My Reflection»
so, many years ago, I picked up a Sigma DP2 digital camera – one of (very) few cameras to make use of the Foveon X3 sensor (nominally, since Sigma bought Foveon) – the chip used layered color sensors rather than mosaiced but never really took off since CMOS Bayer-filter chips where much easier and cheaper to make – although, Sigma being a lens company, not a camera, battery, or sensor company probably had just as much to do with it – the DP2 has a great lens and a fun sensor but the rest of the camera is cantakerous to a fault
→ (wikipedia) Foveon X3 sensor
the problem arises in trying to make use of the files, because, of course, Sigma decided to
go for yet another raw file format (X3F) – the choices were Sigma Photo Pro (slow),
Adobe Camera Raw (eventually), and then a couple of the proprietary raw editors finally
added in support – on Linux, the options come down to running Sigma Photo Pro under Wine
or tracking down Kalpanika’s seven-year-old x3f_extract – I was getting worried
about having to compile from source on Alpine (and my initial fumbles were failures,
compiling relies on the tdd library from 2013 and openTDD’s archive
only goes back to 2016) – Kalpanika does provide binary releases which, initially,
I couldn’t get to run, before remembering Alpine Linux had already planned for that –
adding the gcompat package solved things
→ (github) x3f_extract
→ (alpine) gcompat
(from the documentation)
$ x3f_extract -jpg FILE
(extracts the in-camera rendered JPEG)
$ x3f_extract FILE
(converts the X3F to DNG)
$ x3f_extract -tiff FILE
(converts the X3F to an unrendered TIFF)
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