hi,

On Thu, Jun 13, 2019 at 10:57 PM David C. Partridge
<david.partri...@perdrix.co.uk> wrote:
>
> Hi folks
>
> I've read that the implementation of Frank Markesteijn's X-Trans
> interpolation code in darktable is much faster than that in LibRaw or dcraw.
>
> Is that correct?

i don't know. does libraw still ship demosaicing at all?

> For better or worse I'm using LibRaw to extract regular raw Bayer image data
> and processing that myself, but for Fuji X-Trans and Foveon images I'm
> letting LibRaw::process() convert the image to a 3 colour RGB image and
> catching the output.   Sad to say that the interpolation time for 3 passes
> of xtrans_interpolate() in LibRaw is might slow (40 seconds or so on my i7
> lappie).
>
> So, if it is practical and you folks are OK with it,  I'd like to
> "borrow/reuse" that code in DeepSkyStacker.

sure, it's GPL:

https://github.com/darktable-org/darktable/blob/master/src/iop/demosaic.c#L563

https://github.com/darktable-org/darktable/blob/master/data/kernels/demosaic_markesteijn.cl

cheers,
 jo
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