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Bug #9407

White Balance destroys highlights

Added by Björn Sonnenschein about 7 years ago. Updated over 3 years ago.

Status:
Fixed
Priority:
Low
Assignee:
-
Category:
Darkroom
Target version:
Start date:
05/02/2013
Due date:
% Done:

100%

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

Description

I am using Darktable, built from GIT, on a 64 bit Linux Mint system.

While testing Darktable and Rawtherapee I had noticed that Rawtherapee recovers highlights which are lost for darktable.
As far as I can understand, channels that are clipped by the white balance module cannot be recovered by the highlight recovery module.
That is plausible but a suboptimal behavior in my opinion ;)

To reproduce the issue, just download the attached NEF, apply the WhiteBalance style (Spread highlights to make it more obvious) and play around with the color temperature. Look how the sturcture of the clouds in th top right area above the house disappears on higher color temperature and comes back on lower values around 5000K. I was not able to get a result like rawtherapee gave me out of the box with blending highlight recovery and brightness/contrast adjustments.

DSC_0050.NEF (32.9 MB) DSC_0050.NEF Björn Sonnenschein, 05/02/2013 09:46 PM
WhiteBalance.dtstyle (2.8 KB) WhiteBalance.dtstyle Björn Sonnenschein, 05/02/2013 09:46 PM
RawTherapee.jpg (333 KB) RawTherapee.jpg Björn Sonnenschein, 05/02/2013 09:46 PM
DSC_0070.NEF (23.2 MB) DSC_0070.NEF Björn Sonnenschein, 05/09/2013 08:57 PM
DSC_0070.NEF.pp3 (3.5 KB) DSC_0070.NEF.pp3 Björn Sonnenschein, 05/09/2013 08:57 PM
Screenshot from 2013-11-22 09_13_07.png (894 KB) Screenshot from 2013-11-22 09_13_07.png Simon Spannagel, 11/22/2013 10:17 AM

History

#1 Updated by Björn Sonnenschein about 7 years ago

Added another Image incl. Rawtherapee Preset. To do this manually in RT, just open the image and then turn the highlight recovery value in the exposure module to 140 and activate the blend highlight recovery in the highlight recovery module.

#2 Updated by Simon Spannagel over 6 years ago

I'm not sure I can reproduce your problem, I don't have a screenshot from you showing the darktable issue to compare to.

There have been some changes to highlight reconstruction. With your style applied and the temperature set to 7800K it now looks like the attached image.

Could you check again please and report back?

#3 Updated by Roman Lebedev over 3 years ago

  • % Done changed from 20 to 100
  • Status changed from Incomplete to Fixed

With git master and highlight reconstruction = lch DSC_0050.NEF looks fine in git master.

#4 Updated by Roman Lebedev over 3 years ago

  • Target version set to 2.2.0

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