Hi devs,

I created noise profile for Darktable for the Canon G15. I have tested the
profile on my own pictures with amazing results. I am definitely using them
for now.

Temporarily, I put them here:
https://github.com/sbougerel/darktable/tree/master/tools/noise/G15%20Noise%20Profile

I took several shoots per ISO in fact, and it seems the values {a, b}
increase a bit with every shot. I wonder if it's an artefact of computation
or simply normal. In the final shipped version - I suppose - only 1 value
should be retained.

I would need your advance: should I pick 1 (low, high, median) or should I
average, or - in fact - should I *not* do anything and keep the different
values. Once done, I can give you a pull request, on github, if you want.

I will be away next week, so I won't reply immediately. But I will gladly
hear about your comments.

Regards,
Sylvain

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