Re: [darktable-dev] Nikon 1 V1

[Roman Lebedev]

Hi.

On Sat, Sep 17, 2016 at 2:04 PM, Robert William Hutton
 wrote:
> On 17/09/16 20:48, Prof. Dr. Stefan Schmidt wrote:
>>
>> Last week my Kubuntu 16.04 crashed and I had to do a complete new setup
>> of the whole system. By that chance I also upgraded from dt 2.04 to 2.0.6.
>>
>> Since that I cannot open my Nikon 1v1 raw files (*.NEF).
>>
>> I am desperate sitting on 800 new pictures from our summer holiday
>
>
> Hi Stefan,
>
> Not sure why your camera isn't supported any more,
It was fixed later on https://redmine.darktable.org/issues/11137

> I'll leave that to an actual dev to comment on.

The root cause is: nikon can write up to 4 different raw formats:
14bit compressed, 14bit uncompressed, 12bit compressed, 12bit uncompressed.

Unsurprisingly, 12-bit and 14-bit have different white levels.
Additionally, old code assumed that "*-compressed" always have a fixed
whitelevels of (2^bitness)-1), i.e. 4095 or 16383.

For that reason, many nikon cameras in cameras.xml had completely
arbitrary whitelevel specified,
which resulted in wrong image => either way too bright (if 12bit wl
was specified, and image is from 14bit-uncompressed)
or too dark and with purple highlights (if 14bit wl was specified, and
image is from 12bit-uncompressed)
or with just purple highlights (all other cases, e.g. "*-compressed").

And no one noticed that ^ it was completely and utterly broken.

So when i finally did notice that, i had zero options other than just
disable all the nikon cameras
for which we do not have proper whitelevel information, and then add
the support back
on per-camera case once someone provides all the necessary samples.

This is the script that gives the list of broken (and disabled in git
master) nikon cameras:
https://github.com/darktable-org/darktable/blob/master/tools/rawspeed-check-nikon-modes.rb

If your camera is in that output, one needs to provide samples to redmine
(but do check for duplicates first!)

> However, since you mention that you're desperate,
> you could build from source.  The general instructions are here:
>
> https://redmine.darktable.org/projects/darktable/wiki/Building_darktable_20#General-build-instructions
>
> And how to install the dependencies for your system here:
>
> https://redmine.darktable.org/projects/darktable/wiki/Building_darktable_20#Ubuntu-1604
>
> To get the older version (2.0.4 in your case) you would do:
>
> git checkout release-2.0.4
> rm -rf build
> ./build.sh
>
> rather than using the latest version (2.0.6).
>
> Then you would install:
>
> cd "./build"; sudo make install
>
> And run the version you just installed:
>
> /opt/darktable/bin/darktable
>
> You have to run it this way to avoid using the version installed by your
> operating system.
>
> HTH,
>
> Rob
Roman.

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Re: [darktable-dev] Nikon 1 V1

[Robert William Hutton]

On 17/09/16 20:48, Prof. Dr. Stefan Schmidt wrote:

Last week my Kubuntu 16.04 crashed and I had to do a complete new setup
of the whole system. By that chance I also upgraded from dt 2.04 to 2.0.6.

Since that I cannot open my Nikon 1v1 raw files (*.NEF).

I am desperate sitting on 800 new pictures from our summer holiday


Hi Stefan,

Not sure why your camera isn't supported any more, I'll leave that to an 
actual dev to comment on.  However, since you mention that you're 
desperate, you could build from source.  The general instructions are here:


https://redmine.darktable.org/projects/darktable/wiki/Building_darktable_20#General-build-instructions

And how to install the dependencies for your system here:

https://redmine.darktable.org/projects/darktable/wiki/Building_darktable_20#Ubuntu-1604

To get the older version (2.0.4 in your case) you would do:

git checkout release-2.0.4
rm -rf build
./build.sh

rather than using the latest version (2.0.6).

Then you would install:

cd "./build"; sudo make install

And run the version you just installed:

/opt/darktable/bin/darktable

You have to run it this way to avoid using the version installed by your 
operating system.


HTH,

Rob
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