Re: [darktable-user] Re: Is it possible to configure "alias lenses"

[Аl Воgnеr]

Am Sat, 29 Jul 2017 13:24:44 +0200
schrieb Torsten Bronger :

Hello,

> For me, as a Lensfun contributor, it is important to define which
> things should be solved on the Lensfun level, which on the exiv2
> level, and which on the DT level.
> 
> Аl Воgnеr writes:
> 
> > [...]
> >
> > alias lenses of existing lensfun-lenses in dt.  
> 
> Lensfun's DB is a proper place for aliases.  Lensfun surely will
> grow this feature.  Whether DT makes use of that, or adds an
> aliasing feature itself, is another question.

I agree, that lensfun should collect all the lenses (at the end). The
question is, if darktable should offer a quick solution for alias
lenses, which the user can define *immediately*. IMHO yes.

> > notice / warning in dt if an alias lens was added to lensfun.  
> 
> Can you elaborate on this?  Besides, assumed that an alias feature
> is available in Lensfun or DT, why are further steps necessary?

So if darktable allows alias lenses by the user, which are not in the
lensfun database, the user should be informed, that the dt-alias-lens
is now available in the lensfun database, so that the dt-alias can be
removed. Actually it is not so important if it is an alias lens. If I
think a workaround could be to use the correction of lens B for lens A,
I should be able to do this.

IMHO the xmp-file should contain the lensfun-lens, and not the
alias-name, which lensfun doesn't know at this time. This is the same
as I do manually now.


> > [...]
> >  
> >> That said, often one gets away with expanding the lens model
> >> name.  Note that excess words in a lens model name are ignored by
> >> Lensfun while matching (at least in the mode by which Darktable
> >> uses Lensfun).  This does not help with the smc/HD thingy, but
> >> e.g. an A09 can be appended without making the database
> >> inaccurate.  
> >
> > The next problem is a solution to get new lenses available in
> > darktable, easy and fast for the user.  
> 
> There is lensfun-update-data.


I fear this isn't included with Ubuntu Xenial as well as
g-lensfun-update-data. In earlier discussions nobody mentioned this.

# aptitude search lensfun | cut -c1-60
i   gimp-lensfun- Gimp plugin to correct
p   gimp-lensfun:i386   - Gimp plugin to correct
i A liblensfun-data - Lens Correction librar
v   liblensfun-data:i386-   
p   liblensfun-dev  - Lens Correction librar
p   liblensfun-dev:i386 - Lens Correction librar
p   liblensfun-doc  - Lens Correction librar
i A liblensfun0 - Lens Correction librar
p   liblensfun0:i386- Lens Correction librar

I searched a little bit, but still don't know how to use it with Ubuntu.

http://lensfun.sourceforge.net/manual/lensfun-update-data.html
https://www.mankier.com/1/lensfun-update-data

Thanks for this discussion! I think this is a very important topic how
to manage not recognized lenses and cameras. As you already mentioned,
camera aliases are important too. My lens is recognized e.g., but the
camera not, so I have to define a camera for every image, although all
Pentax-APSC-DLSR have the same data.

AFAIK it depends on the sensor size, so why not a suggested sensor size
if the camera is not available. Eg. it is recognized that the photo was
taken with a unknown Pentax-DSLR, so dt should make a suggestion for
Pentax APS-C, which can be predefined in preferences.

Al

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[darktable-user] renaming files

[darktable]

DT 2.2.5

How should I rename a whole bunch of images from:

text-mmdd.raf to text-mmdd-.raf

Is there a better way than: select > remove > rename in thunar the
rafs and the xmps and reimport?

-- 
sknahT

vyS

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[darktable-user] Re: Is it possible to configure "alias lenses"

[Torsten Bronger]

Hallöchen!

For me, as a Lensfun contributor, it is important to define which
things should be solved on the Lensfun level, which on the exiv2
level, and which on the DT level.

Аl Воgnеr writes:

> [...]
>
> alias lenses of existing lensfun-lenses in dt.

Lensfun's DB is a proper place for aliases.  Lensfun surely will
grow this feature.  Whether DT makes use of that, or adds an
aliasing feature itself, is another question.

> notice / warning in dt if an alias lens was added to lensfun.

Can you elaborate on this?  Besides, assumed that an alias feature
is available in Lensfun or DT, why are further steps necessary?

> [...]
>
>> That said, often one gets away with expanding the lens model
>> name.  Note that excess words in a lens model name are ignored by
>> Lensfun while matching (at least in the mode by which Darktable
>> uses Lensfun).  This does not help with the smc/HD thingy, but
>> e.g. an A09 can be appended without making the database
>> inaccurate.
>
> The next problem is a solution to get new lenses available in
> darktable, easy and fast for the user.

There is lensfun-update-data.

Tschö,
Torsten.

-- 
Torsten Bronger


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