Blue LED light? That's a known issue for digital photography.

This topic is covered in the user manual: 
http://www.darktable.org/usermanual/ch03s02s10.html.php

Have a look at sections 3.2.10.2 and 3.2.10.3.

Ulrich

Am 13.03.2015 um 21:22 schrieb Chris:
> Hi,
>
> I try to process some concert pictures with coloured lights and some
> with mainly blue lights are very bad in darkroom with default settings.
> See the comparison of camera jpeg (left) vs raw in darkroom (right) at
>    http://dl.free.fr/kHTlV0HuY.
> Original raw is at http://dl.free.fr/bScNE4nMl
> and original jpeg at http://dl.free.fr/kTCJN3GCx
>
> I'm unable to approach the camera jpeg quality :-(
>
> Any idea ?
>
> Chris
>

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