Re: [darktable-dev] Manual lens corrections - feature request

2017-11-16 Thread Heiko Bauke 

Hi,

Am 15.11.2017 um 16:59 schrieb Bernhard:

Heiko Bauke schrieb am 15.11.2017 um 13:35:

How would you understand »in-camera RAW image development«?

usually you determine if you shoot RAW, JPEG or both.
Some new cameras offer the possibility to shoot RAW and get JPEGs
_after_ the shot by e.g. determining a picture style and do development
in camera.


ok. I may have overinterpreted some advertisement statements.  I was not 
aware that these cameras offer in-camera RAW post-processing.


Coming back to my initial statement, the only thing that I wanted to say 
was that contrary to common belief the RAW files that you get out of 
your camera represent by no means plain raw sensor data.  When a RAW 
file is written to the SD-card the image data already went from the 
sensor though several steps of the image processing pipeline, analog and 
digital.  Although not all camera makers go so far to bake lens 
corrections into the RAW file.


I would never recommend to bake lens corrections into the RAW file (as 
it is possible with Sony) as a default procedure.  However, the idea 
that one corrects some lens errors already in the camera in the RAW file 
appears less crazy when you realize that RAW files do to really 
represent raw data.



Heiko


PS: May be we should stop here, it's going to get off-topic.

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Re: [darktable-dev] Manual lens corrections - feature request

2017-11-15 Thread Bernhard 



Heiko Bauke schrieb am 15.11.2017 um 13:35:

How would you understand »in-camera RAW image development«?

usually you determine if you shoot RAW, JPEG or both.
Some new cameras offer the possibility to shoot RAW and get JPEGs 
_after_ the shot by e.g. determining a picture style and do development 
in camera.

https://www.nikonusa.com/en/learn-and-explore/a/tips-and-techniques/nef-processing-in-camera.html

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Re: [darktable-dev] Manual lens corrections - feature request

2017-11-15 Thread Roman Lebedev 
On Wed, Nov 15, 2017 at 3:35 PM, Heiko Bauke  wrote:
> Hi,
>
> Am 15.11.2017 um 12:28 schrieb Roman Lebedev:
>>
>> On Wed, Nov 15, 2017 at 2:14 PM, Heiko Bauke  wrote:
>
> [...]
>>>
>>> Contrary to the common believe that in-camera
>>> corrections are applied to JPEGs but not to the RAW file, in-camera lens
>>> correction in the EOS-1D X Mark II is applied to RAWs only.  See
>>>
>>> https://snapshot.canon-asia.com/article/en/eos-5d-mark-iv-lens-aberration-correctiona-close-up-look-part-1
>>
>>
>> Can you quote that part where it says what you think it says?
>> I don't see anything there about modifying the raw files.
>
>
> the article is about in-camera lens correction.  Lens corrections are stored
> in the image data, it's not about storing meta data for lens correction in
> post processing.  Do not be confused by the fact that there is also a
> software tool provided by Canon that implements the same kind of lens
> correction algorithms for post processing.
>
> The term RAW file is not included explicitly in the article that I
> mentioned.  It is, however, highlighted that »The Digital Lens Optimizer
> [...]  made its debut as an in-camera feature on the EOS-1D X Mark II. At
> that time, its effects could not be reflected in real time on JPEG images.«
> I understand this statement as that the RAW file image data is affected.
> The camera has a special hardware component to do the heavy math.  This
> would not be needed if just some meta data for lens correction in post would
> be included into the RAW file.
>
> Furthermore, another Canon article (see
> https://snapshot.canon-asia.com/article/en/eos-1d-x-mark-ii-in-camera-lens-optimization-for-high-quality-images
> ) says
>
> »The processing ability of the Dual DIGIC 6 + image processing engines is
> what makes in-camera image processing possible. They are capable of
> processing the vast amount of data that is yielded from the 20-megapixel
> sensor and the continuous shooting speed of 16 fps at a high speed, and
> achieve in-camera RAW image development and real-time aberration correction.
> A dedicated IC has been developed and employed to enable the incorporation
> of different aberration correction features during in-camera RAW image.«

> How would you understand »in-camera RAW image development«?  It does
> definitely not refer to the lens correction to the JPEG, because this camera
> does not have such a feature.
You are just plain wrong here. Lens correction for the jpeg's was always there,
provided the lens profile is stored in camera.

> According to
> https://photo.stackexchange.com/questions/35324/why-does-using-canons-digital-lens-optimizer-double-the-size-of-a-raw-file
> in-camera lens correction in Canon cameras doubles the RAW file size,
> because the processed image data is stored in addition to the unprocessed
> RAW data.
Those are just words, there is not a single confirmed fact there, e.g.
exif dumps
that would show that there is a two SubImages even though the
DualPixel is disabled.
But even if it is true, that violates your own words,
since the original unmodified raw is still there.

> Heiko
Roman.

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Re: [darktable-dev] Manual lens corrections - feature request

2017-11-15 Thread Jean-Luc Coulon (f5ibh) 
This is BTW explicitely explained in the manual p 446:
You can process RAW images with the camera and save them as JPEG
images. As the RAW image itself does not change, you can apply different
processing conditions to create any number of JPEG images from it.

And you can apply the following corrections in Lens aberration correction
- Peripheral illumination correction
- Distortion correction
- Digital Lens Optimizer
- Chromatic aberration correction
- Diffraction correction

So the whole "package" of lens aberration correction, IN the camera WITHOUT
affecting the RAW itself.


2017-11-15 13:51 GMT+01:00 Jean-Luc Coulon (f5ibh) <
jean.luc.cou...@gmail.com>:

> I'm getting some raw+jpeg from a Canon 5D MK IV. I will tell you when I
> will have looking in them.
>
> You *suppose* that "in-camera lens correction in Canon cameras doubles the
> RAW file size".
> In fact in the 5D Mk IV, the raw is the same size. It double when you use
> the "dual pixel raw" which contains informations that allow to do some kind
> of focus micro adjusments in post-production.
>
> If I take a shoot in RAW only, I get a RAW.
> Then I go to in-camera processing to get a JPEG.
> I click the lens icone to have the lens corrections applied.
> When done, I get A JPEG but the RAW has not been modified.
>
> Jena-Luc
>
> 2017-11-15 13:35 GMT+01:00 Heiko Bauke :
>
>> Hi,
>>
>> Am 15.11.2017 um 12:28 schrieb Roman Lebedev:
>>
>>> On Wed, Nov 15, 2017 at 2:14 PM, Heiko Bauke 
>>> wrote:
>>>
>> [...]
>>
>>> Contrary to the common believe that in-camera
 corrections are applied to JPEGs but not to the RAW file, in-camera lens
 correction in the EOS-1D X Mark II is applied to RAWs only.  See
 https://snapshot.canon-asia.com/article/en/eos-5d-mark-iv-le
 ns-aberration-correctiona-close-up-look-part-1

>>>
>>> Can you quote that part where it says what you think it says?
>>> I don't see anything there about modifying the raw files.
>>>
>>
>> the article is about in-camera lens correction.  Lens corrections are
>> stored in the image data, it's not about storing meta data for lens
>> correction in post processing.  Do not be confused by the fact that there
>> is also a software tool provided by Canon that implements the same kind of
>> lens correction algorithms for post processing.
>>
>> The term RAW file is not included explicitly in the article that I
>> mentioned.  It is, however, highlighted that »The Digital Lens Optimizer
>> [...]  made its debut as an in-camera feature on the EOS-1D X Mark II. At
>> that time, its effects could not be reflected in real time on JPEG
>> images.«  I understand this statement as that the RAW file image data is
>> affected.  The camera has a special hardware component to do the heavy
>> math.  This would not be needed if just some meta data for lens correction
>> in post would be included into the RAW file.
>>
>> Furthermore, another Canon article (see https://snapshot.canon-asia.co
>> m/article/en/eos-1d-x-mark-ii-in-camera-lens-optimization-fo
>> r-high-quality-images ) says
>>
>> »The processing ability of the Dual DIGIC 6 + image processing engines is
>> what makes in-camera image processing possible. They are capable of
>> processing the vast amount of data that is yielded from the 20-megapixel
>> sensor and the continuous shooting speed of 16 fps at a high speed, and
>> achieve in-camera RAW image development and real-time aberration
>> correction. A dedicated IC has been developed and employed to enable the
>> incorporation of different aberration correction features during in-camera
>> RAW image.«
>>
>> How would you understand »in-camera RAW image development«?  It does
>> definitely not refer to the lens correction to the JPEG, because this
>> camera does not have such a feature.
>>
>> According to https://photo.stackexchange.com/questions/35324/why-does-usi
>> ng-canons-digital-lens-optimizer-double-the-size-of-a-raw-file
>> in-camera lens correction in Canon cameras doubles the RAW file size,
>> because the processed image data is stored in addition to the unprocessed
>> RAW data.
>>
>>
>> Heiko
>>
>>
>> --
>> -- Number Crunch Blog @ https://www.numbercrunch.de
>> --  Cluster Computing @ http://www.clustercomputing.de
>> --   Professional @ https://www.mpi-hd.mpg.de/personalhomes/bauke
>> --  Social Networking @ https://www.researchgate.net/profile/Heiko_Bauke
>>
>
>

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Re: [darktable-dev] Manual lens corrections - feature request

2017-11-15 Thread Jean-Luc Coulon (f5ibh) 
I'm getting some raw+jpeg from a Canon 5D MK IV. I will tell you when I
will have looking in them.

You *suppose* that "in-camera lens correction in Canon cameras doubles the
RAW file size".
In fact in the 5D Mk IV, the raw is the same size. It double when you use
the "dual pixel raw" which contains informations that allow to do some kind
of focus micro adjusments in post-production.

If I take a shoot in RAW only, I get a RAW.
Then I go to in-camera processing to get a JPEG.
I click the lens icone to have the lens corrections applied.
When done, I get A JPEG but the RAW has not been modified.

Jena-Luc

2017-11-15 13:35 GMT+01:00 Heiko Bauke :

> Hi,
>
> Am 15.11.2017 um 12:28 schrieb Roman Lebedev:
>
>> On Wed, Nov 15, 2017 at 2:14 PM, Heiko Bauke  wrote:
>>
> [...]
>
>> Contrary to the common believe that in-camera
>>> corrections are applied to JPEGs but not to the RAW file, in-camera lens
>>> correction in the EOS-1D X Mark II is applied to RAWs only.  See
>>> https://snapshot.canon-asia.com/article/en/eos-5d-mark-iv-le
>>> ns-aberration-correctiona-close-up-look-part-1
>>>
>>
>> Can you quote that part where it says what you think it says?
>> I don't see anything there about modifying the raw files.
>>
>
> the article is about in-camera lens correction.  Lens corrections are
> stored in the image data, it's not about storing meta data for lens
> correction in post processing.  Do not be confused by the fact that there
> is also a software tool provided by Canon that implements the same kind of
> lens correction algorithms for post processing.
>
> The term RAW file is not included explicitly in the article that I
> mentioned.  It is, however, highlighted that »The Digital Lens Optimizer
> [...]  made its debut as an in-camera feature on the EOS-1D X Mark II. At
> that time, its effects could not be reflected in real time on JPEG
> images.«  I understand this statement as that the RAW file image data is
> affected.  The camera has a special hardware component to do the heavy
> math.  This would not be needed if just some meta data for lens correction
> in post would be included into the RAW file.
>
> Furthermore, another Canon article (see https://snapshot.canon-asia.co
> m/article/en/eos-1d-x-mark-ii-in-camera-lens-optimization-
> for-high-quality-images ) says
>
> »The processing ability of the Dual DIGIC 6 + image processing engines is
> what makes in-camera image processing possible. They are capable of
> processing the vast amount of data that is yielded from the 20-megapixel
> sensor and the continuous shooting speed of 16 fps at a high speed, and
> achieve in-camera RAW image development and real-time aberration
> correction. A dedicated IC has been developed and employed to enable the
> incorporation of different aberration correction features during in-camera
> RAW image.«
>
> How would you understand »in-camera RAW image development«?  It does
> definitely not refer to the lens correction to the JPEG, because this
> camera does not have such a feature.
>
> According to https://photo.stackexchange.com/questions/35324/why-does-usi
> ng-canons-digital-lens-optimizer-double-the-size-of-a-raw-file
> in-camera lens correction in Canon cameras doubles the RAW file size,
> because the processed image data is stored in addition to the unprocessed
> RAW data.
>
>
> Heiko
>
>
> --
> -- Number Crunch Blog @ https://www.numbercrunch.de
> --  Cluster Computing @ http://www.clustercomputing.de
> --   Professional @ https://www.mpi-hd.mpg.de/personalhomes/bauke
> --  Social Networking @ https://www.researchgate.net/profile/Heiko_Bauke
>

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Re: [darktable-dev] Manual lens corrections - feature request

2017-11-15 Thread Heiko Bauke 

Hi,

Am 15.11.2017 um 12:28 schrieb Roman Lebedev:

On Wed, Nov 15, 2017 at 2:14 PM, Heiko Bauke  wrote:

[...]

Contrary to the common believe that in-camera
corrections are applied to JPEGs but not to the RAW file, in-camera lens
correction in the EOS-1D X Mark II is applied to RAWs only.  See
https://snapshot.canon-asia.com/article/en/eos-5d-mark-iv-lens-aberration-correctiona-close-up-look-part-1


Can you quote that part where it says what you think it says?
I don't see anything there about modifying the raw files.


the article is about in-camera lens correction.  Lens corrections are 
stored in the image data, it's not about storing meta data for lens 
correction in post processing.  Do not be confused by the fact that 
there is also a software tool provided by Canon that implements the same 
kind of lens correction algorithms for post processing.


The term RAW file is not included explicitly in the article that I 
mentioned.  It is, however, highlighted that »The Digital Lens Optimizer 
[...]  made its debut as an in-camera feature on the EOS-1D X Mark II. 
At that time, its effects could not be reflected in real time on JPEG 
images.«  I understand this statement as that the RAW file image data is 
affected.  The camera has a special hardware component to do the heavy 
math.  This would not be needed if just some meta data for lens 
correction in post would be included into the RAW file.


Furthermore, another Canon article (see 
https://snapshot.canon-asia.com/article/en/eos-1d-x-mark-ii-in-camera-lens-optimization-for-high-quality-images 
) says


»The processing ability of the Dual DIGIC 6 + image processing engines 
is what makes in-camera image processing possible. They are capable of 
processing the vast amount of data that is yielded from the 20-megapixel 
sensor and the continuous shooting speed of 16 fps at a high speed, and 
achieve in-camera RAW image development and real-time aberration 
correction. A dedicated IC has been developed and employed to enable the 
incorporation of different aberration correction features during 
in-camera RAW image.«


How would you understand »in-camera RAW image development«?  It does 
definitely not refer to the lens correction to the JPEG, because this 
camera does not have such a feature.


According to 
https://photo.stackexchange.com/questions/35324/why-does-using-canons-digital-lens-optimizer-double-the-size-of-a-raw-file
in-camera lens correction in Canon cameras doubles the RAW file size, 
because the processed image data is stored in addition to the 
unprocessed RAW data.



Heiko

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Re: [darktable-dev] Manual lens corrections - feature request

2017-11-15 Thread Jean-Luc Coulon (f5ibh) 
.> correction in the EOS-1D X Mark II is applied to RAWs only.  See
> https://snapshot.canon-asia.com/article/en/eos-5d-mark-iv-le
ns-aberration-correctiona-close-up-look-part-1




I cannot read on this link  that the correction in done on the RAW.
In the past, the lens identification was in the EXIF and DPP has a database
of these lenses. It was then applying the corrections. In camera the only
correction applied to the JPEG was the vignetting (this is the case on EOS
7D and EOS 5D Mk II at least).

If I follow the link to the 1D Mk II, I can read:
"The EOS-1D X Mark II is equipped with an IC that was specially developed
to enable correction by the Digital Lens Optimizer (DLO) during in-camera
RAW image post-processing."

But "in-camera processing of the RAW" doesnt mean the RAW is affected. This
is done in the RAW -> JPEG in-camera conversion.

My son is a photographer. For the newspapers, they use only the in-camera
JPEG. This is because in the past there was too many "fake" photographies.
And they have tools to say if the picture has been retouched in
Photoshp/what_you_want. All is allowed is crop / Brightness / Saturation /
Contrast.

I can be wrong about these camera but I will get some raw from a 5D MK IV
and see if the raw is affected

Jean-Luc

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Re: [darktable-dev] Manual lens corrections - feature request

2017-11-15 Thread Roman Lebedev 
On Wed, Nov 15, 2017 at 2:14 PM, Heiko Bauke  wrote:
> Hi,
Hi.

> Am 15.11.2017 um 11:25 schrieb Jean-Luc Coulon (f5ibh):
>>
>> Personnaly, I think it is a bad idea [tm] to include anything in the raw
>> file.
>> If you change your mind, you cannot get back...
>
>
> I totally agree with that one should apply corrections to RAW files that are
> eventually baked into the RAW file with care.

> It is, however, a
> misconception that RAW files would contain plain sensor data.
>
> Virtually all cameras process, e.g., sharpen, the image to some degree
> before the RAW file is stored.  ISO settings and even white balance settings
> can have an effect on the RAW file.  In-camera lens correction is also done
> in some newer Canon cameras.
> Contrary to the common believe that in-camera
> corrections are applied to JPEGs but not to the RAW file, in-camera lens
> correction in the EOS-1D X Mark II is applied to RAWs only.  See
> https://snapshot.canon-asia.com/article/en/eos-5d-mark-iv-lens-aberration-correctiona-close-up-look-part-1

Yeah no, i'm calling bullshit on most of that.
There are some idiotic manufacturers that modify raws (namely, sony),
but i bet most others don't.

> Contrary to the common believe that in-camera
> corrections are applied to JPEGs but not to the RAW file, in-camera lens
> correction in the EOS-1D X Mark II is applied to RAWs only.  See
> https://snapshot.canon-asia.com/article/en/eos-5d-mark-iv-lens-aberration-correctiona-close-up-look-part-1

Can you quote that part where it says what you think it says?
I don't see anything there about modifying the raw files.

> Heiko
Roman.

> --
> -- Number Crunch Blog @ https://www.numbercrunch.de
> --  Cluster Computing @ http://www.clustercomputing.de
> --   Professional @ https://www.mpi-hd.mpg.de/personalhomes/bauke
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Re: [darktable-dev] Manual lens corrections - feature request

2017-11-15 Thread Heiko Bauke 

Hi,

Am 15.11.2017 um 11:25 schrieb Jean-Luc Coulon (f5ibh):
Personnaly, I think it is a bad idea [tm] to include anything in the raw 
file.

If you change your mind, you cannot get back...


I totally agree with that one should apply corrections to RAW files that 
are eventually baked into the RAW file with care.  It is, however, a 
misconception that RAW files would contain plain sensor data.


Virtually all cameras process, e.g., sharpen, the image to some degree 
before the RAW file is stored.  ISO settings and even white balance 
settings can have an effect on the RAW file.  In-camera lens correction 
is also done in some newer Canon cameras.  Contrary to the common 
believe that in-camera corrections are applied to JPEGs but not to the 
RAW file, in-camera lens correction in the EOS-1D X Mark II is applied 
to RAWs only.  See

https://snapshot.canon-asia.com/article/en/eos-5d-mark-iv-lens-aberration-correctiona-close-up-look-part-1


Heiko

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Re: [darktable-dev] Manual lens corrections - feature request

2017-11-15 Thread bigmackcam 
To clarify, I'm not suggesting that this feature would affect the RAW file. It would be applied in the same way as the perspective distortion control - i.e. non-destructive and additive within a processing session.

 

The feature is available in most of the RAW development tools I've used, from those bundled with cameras to Lightroom, ON1, Capture One, Aftershot Pro 3 etc. None of those applications affect the RAW file. In the case of Lightroom, I believe the adjustments are stored within the image database and/or XMP sidecar file. I'm not sure how adjustments are saved in Darktable, but imagine it's something similar.

 

One further point re my lenses - I should have mentioned that I collect vintage lenses, and have a large number including some quite obscure models. It would take me months, perhaps years, to take test shots for all of them, and presumably a long time for the profiles to be created. 

 

Thanks again.

 

Mike

 

Sent: Wednesday, November 15, 2017 at 10:25 AM
From: "Jean-Luc Coulon (f5ibh)" <jean.luc.cou...@gmail.com>
To: No recipient address
Cc: darktable <darktable-dev@lists.darktable.org>
Subject: Re: [darktable-dev] Manual lens corrections - feature request



Hi,

Personnaly, I think it is a bad idea [tm] to include anything in the raw file.

If you change your mind, you cannot get back...

 

This kind of feature is very handy for jpeg shoot but even then it depends of what you do with the jpeg: direct sharing/printing/hosting or if you want to process it a bit later.

 

Jean-Luc


 
2017-11-15 10:44 GMT+01:00 Heiko Bauke <heiko.ba...@mail.de>:

Hi,

Am 14.11.2017 um 20:39 schrieb bigmack...@mail.com:

New user here, so apologies if I'm posting to the wrong list!
I've just switched fully from Lightroom 6 to Darktable 2.2.5 under Linux. Kudos to the developers - it's superb.
The one and only feature I'm missing in Darktable is the ability to adjust for barrel or pincushion distortion manually. I realise lenses can be profiled for the "Lens Correction" module, but this is time consuming and doesn't allow for fine tuning of distortion to my own tastes (sometimes I don't want to fully correct, or I may perhaps add in a little distortion). At present, I have to export my files to TIFF, open them in GIMP and carry out adjustments in GIMP's "Lens Distortion" feature. This makes no sense when other correction features are provided within Darktable itself.
darktable-dev+unsubscr...@lists.darktable.org

yes this might be a useful feature, especially for those who shoot with exotic lenses.

In case that you take pictures with Sony cameras: There is a camera app that does manual lens correction (peripheral shading, chromatic aberration and distortion) in camera.  All corrections are included in the RAW file.
https://www.youtube.com/watch?v=CWe_ePAHSfk


        Heiko

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Re: [darktable-dev] Manual lens corrections - feature request

2017-11-15 Thread Jean-Luc Coulon (f5ibh) 
Hi,
Personnaly, I think it is a bad idea [tm] to include anything in the raw
file.
If you change your mind, you cannot get back...

This kind of feature is very handy for jpeg shoot but even then it depends
of what you do with the jpeg: direct sharing/printing/hosting or if you
want to process it a bit later.

Jean-Luc

2017-11-15 10:44 GMT+01:00 Heiko Bauke :

> Hi,
>
> Am 14.11.2017 um 20:39 schrieb bigmack...@mail.com:
>
>> New user here, so apologies if I'm posting to the wrong list!
>> I've just switched fully from Lightroom 6 to Darktable 2.2.5 under Linux.
>> Kudos to the developers - it's superb.
>> The one and only feature I'm missing in Darktable is the ability to
>> adjust for barrel or pincushion distortion manually. I realise lenses can
>> be profiled for the "Lens Correction" module, but this is time consuming
>> and doesn't allow for fine tuning of distortion to my own tastes (sometimes
>> I don't want to fully correct, or I may perhaps add in a little
>> distortion). At present, I have to export my files to TIFF, open them in
>> GIMP and carry out adjustments in GIMP's "Lens Distortion" feature. This
>> makes no sense when other correction features are provided within Darktable
>> itself.
>> darktable-dev+unsubscr...@lists.darktable.org
>>
>
> yes this might be a useful feature, especially for those who shoot with
> exotic lenses.
>
> In case that you take pictures with Sony cameras: There is a camera app
> that does manual lens correction (peripheral shading, chromatic aberration
> and distortion) in camera.  All corrections are included in the RAW file.
> https://www.youtube.com/watch?v=CWe_ePAHSfk
>
>
> Heiko
>
> --
> -- Number Crunch Blog @ https://www.numbercrunch.de
> --  Cluster Computing @ http://www.clustercomputing.de
> --   Professional @ https://www.mpi-hd.mpg.de/personalhomes/bauke
> --  Social Networking @ https://www.researchgate.net/profile/Heiko_Bauke
>
> 
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Re: [darktable-dev] Manual lens corrections - feature request

2017-11-15 Thread Heiko Bauke 

Hi,

Am 14.11.2017 um 20:39 schrieb bigmack...@mail.com:

New user here, so apologies if I'm posting to the wrong list!
I've just switched fully from Lightroom 6 to Darktable 2.2.5 under 
Linux. Kudos to the developers - it's superb.
The one and only feature I'm missing in Darktable is the ability to 
adjust for barrel or pincushion distortion manually. I realise lenses 
can be profiled for the "Lens Correction" module, but this is time 
consuming and doesn't allow for fine tuning of distortion to my own 
tastes (sometimes I don't want to fully correct, or I may perhaps add in 
a little distortion). At present, I have to export my files to TIFF, 
open them in GIMP and carry out adjustments in GIMP's "Lens Distortion" 
feature. This makes no sense when other correction features are provided 
within Darktable itself.

darktable-dev+unsubscr...@lists.darktable.org


yes this might be a useful feature, especially for those who shoot with 
exotic lenses.


In case that you take pictures with Sony cameras: There is a camera app 
that does manual lens correction (peripheral shading, chromatic 
aberration and distortion) in camera.  All corrections are included in 
the RAW file.

https://www.youtube.com/watch?v=CWe_ePAHSfk


Heiko

--
-- Number Crunch Blog @ https://www.numbercrunch.de
--  Cluster Computing @ http://www.clustercomputing.de
--   Professional @ https://www.mpi-hd.mpg.de/personalhomes/bauke
--  Social Networking @ https://www.researchgate.net/profile/Heiko_Bauke
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