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Bug #9548

Spot white balance does not work correctly on cropped image

Added by Robert Hutton over 5 years ago. Updated over 5 years ago.

Status:
Fixed
Priority:
Medium
Assignee:
-
Category:
Darkroom
Start date:
08/04/2013
Due date:
% Done:

100%

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

Description

When working with the spot white balance tool, if you crop the image then the spot white balance tool will only work on an area of the image in the top left corner that corresponds to the size of the crop. The spot white balance tool therefore only works correctly if the crop is applied in the top left corner. If the cropped area does not overlap with a rectangle of the same size centred on the top left corner then the spot white balance does not work at all.

To replicate bug:
- Open any file in darkroom mode
- Crop the image to the top left 1/4 of the image, and apply the crop.
- Note that the spot white balance tool works as expected

- Move the cropped area to the top right quadrant of the image.
- Note that the spot white balance tool does not work at all.

- Move the cropped area to the top middle of the image.
- Note that the spot white balance tool only works in the left half of the cropped area.

I discovered this bug while working on my most recent darktable tutorial video, so you can see the bug in action here: https://www.youtube.com/watch?v=UsJ8ZdLkBjE#t=10m30s

Tested with raw files from Canon 350D and 5D mark iii as well as a JPEG file. The bug behaves the same with all file types.

Bug verified in version: 1.3+714~g454b78a

History

#1 Updated by Ulrich Pegelow over 5 years ago

  • % Done changed from 0 to 100
  • Status changed from New to Fixed

Hi,

I watched your video this morning and very much liked it - really good and very instructive!

The bug has already been fixed.

#2 Updated by Robert Hutton over 5 years ago

Wow, that was quick! Glad you liked the tutorial. :)

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