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Specifications of Foveon X3F files

Started Jan 11, 2017 | Questions thread
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james123 New Member • Posts: 21
Specifications of Foveon X3F files

Hi everyone,

I am looking for the specifications of Foveon X3F files. The only thing I was able to find is a document on an estonian site:

http://www.stv.ee/~donq/sigma/d/x3f-raw-format.pdf

However it is an old file and, for example, it doesn't describe properly the X3F written by the SD1 (which are version 3.00 while this document only describes 2.xx). While the main structure of the file looks similar between 2 and 3, the image RAW type of the SD1 is not described in this document.

I used two programs to try to decode raw data. x3f by Roland Karlsson does apparently the job properly (the image looks correct), but even with the -unprocessed flag it is performing some magic I don't understand (the apparent size of the raw image is 4928x3264 according to the headers of the IMA2 section while the image returned by x3f size is 4704x3136). David Coffin dcraw (with -D  -j flags) return a 4928x3264 file but the image is apparently not correct, probably because of some additional pixels. I probably could do some reverse engineering on these programs but I'd rather have the sigma original specifications.

Any help would be appreciated.

Thanks

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