Hi,

although there is now even denoise support for the RAW DNG's created by
LG's Nexus 5X phone main camera, the basecurve between JPG and RAW seems
very much off. I was trying to follow
http://www.darktable.org/2013/10/about-basecurves/ to create my own
basecurve, but the result was much worse:

While dt-curve-tool-helper worked following a mixture of the article and
the tools/basecurve/README.md for both RAW DNGs/JPGs, and the curve tool
invocation generated a useable shell script (attached), this did not look
like a curve at all and had horrible colours.

I tried with both a black/white picture following the blog instructions, as
well as a normally exposed one. You can find them here (my own work and
CC0-licensed):

https://srv.cornils.net/DSC_0132.DNG
https://srv.cornils.net/DSC_0132.JPG
https://srv.cornils.net/DSC_0135.DNG
https://srv.cornils.net/DSC_0135.JPG

(will leave them up there for at least six months)

How can I get a reasonable basecurve out of those images? They were
generated by FV-5 camera app, which has DNG RAW support.

Thanks
-Malte

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Attachment: mycurves.sh
Description: Bourne shell script

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