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Feature #10024

Pentax K-3 Multi White Balance support

Added by Marcin Gwizdal over 3 years ago. Updated over 3 years ago.

Status:
Closed: won't fix
Priority:
Low
Assignee:
-
Category:
General
Target version:
Start date:
07/25/2014
Due date:
% Done:

0%

Affected Version:
git development version
System:
all
bitness:
64-bit
hardware architecture:
amd64/x86

Description

Pentax K-3 got 2 options for auto balance. Standard 'Auto White Balance' which works pretty much like every other Auto White Balance (AWB) in every other DSLR. This hot full support in Darktable when reading RAWs.
Second option for auto white balance is something that Pentax introduced in K-3 model and is called Multi White Balance. Basically camera is adjusting white balance for different sections of the photo depending on the light and producing as an output better white balance setting for whole scene.
This feature is not supported by Darktable.

I took 4 shots with 'normal' AWB and with Multi WB.

Feel free to download below photos in DNG format --> https://www.dropbox.com/sh/t76hrpb8l5cbpe2/AAC91we7SQAZaRTfEgVJb-q6a
1st scene
  • IMGP2819 - normal AWB,
  • IMGP2820 - Multi White balance
    2nd scene
  • IMGP2821 - normal AWB
  • IMGP2822 - Multi White Balance

History

#1 Updated by Marcin Gwizdal over 3 years ago

Pentax K-3 got 2 options for auto balance. Standard 'Auto White Balance' which works pretty much like every other Auto White Balance (AWB) in every other DSLR. This got full support in Darktable when reading RAWs.
Second option for auto white balance is something that Pentax introduced in K-3 model and is called Multi White Balance. Basically camera is adjusting white balance for different sections of the photo depending on the light and producing as an output better white balance setting for whole scene.
This feature is not supported by Darktable.

I took 4 shots with 'normal' AWB and with Multi WB.
Feel free to download below photos in DNG format --> https://www.dropbox.com/sh/t76hrpb8l5cbpe2/AAC91we7SQAZaRTfEgVJb-q6a
1st scene

IMGP2819 - normal AWB,
IMGP2820 - Multi White balance
2nd scene
IMGP2821 - normal AWB
IMGP2822 - Multi White Balance

#2 Updated by Roman Lebedev over 3 years ago

  • Affected Version changed from 1.4.2 to git development version
  • Priority changed from Medium to Low
  • Assignee deleted (Developers)

"Vendor/camera specific gimmick features like this, are extremely low on our priority list. So this is unlikely to ever be implemented unless someone takes a personal interest.

And they often entail a significant maintenance burden to keep things working, while only offering a benefit to a very small subset of users."
Pascal de Bruijn

#3 Updated by Pascal de Bruijn over 3 years ago

  • Status changed from New to Closed: won't fix
  • Target version changed from Candidate for next major release to Future

I don't think we want vendor specific features like this in Darktable. It's just a maintenance nightware waiting to happen.

#4 Updated by Marcin Gwizdal over 3 years ago

Do not want to be awkward or something, but looks like most stuff brought up regarding Pentax K-3 support is "vendor specific only" or "gimmick feature". Just wondering if features like this which are making or HDR photos or settings for white balance easier and better would be introduced in Nikon or Canon would be discarded so quickly as well. Just wondering... Maybe other users of Darktable and Pentax cameras especially (or other DSLRs that got some features that would be nice to see in Darktable) would say what they think about it.
I am not programmer, but how implementing white balance settings (in this case multi) is nightmare. Hmmm...

#5 Updated by Pascal de Bruijn over 3 years ago

Other vendors specific features like Canon ALO, Canon HTP, Nikon Active Delight, etc. We do not support either. So no we are not picking favorites.

And implementing a feature such as this is a rediculous amount of work, since these feature are typically completely undocumented and require reverse engineering (that is often completely camera specific, which means for each and every camera released, adjustments would have to be made).

So yes you're are gravely underestimating the effort needed to support this feature, and the continued effort it would take to keep in working.

#6 Updated by Tobias Ellinghaus over 3 years ago

Just as a general note, we should never confuse JPEG processing stuff done in camera with metadata added to the raw that we can make use of. Auto WB is the latter, we can read the value from the EXIF data and apply it. Other things like ALO, Active Delight are the first and not relevant at all for raw processing. What the fancy new Pentax WB does is beyond me, it might be either one. So chances are that even if we tried hard it wouldn't even be possible to make use of it because it's just something done to the processed JPEGs in camera. A similar topic is that dynamic range increasing feature of some of the XTrans Fuji cameras.

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