[Digikam-devel] [digikam] [Bug 366095] New: Raw files not (always) properly decoded when using "raw data in half size" option for preview

[via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=366095

            Bug ID: 366095
           Summary: Raw files not (always) properly decoded when using
                    "raw data in half size" option for preview
           Product: digikam
           Version: 5.0.0
          Platform: MS Windows
               URL: https://postimg.org/image/ynsr9yt0h/
                OS: MS Windows
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: Preview
          Assignee: digikam-devel at kde.org
          Reporter: elfie.groslin at gmail.com

When previewing raw files using the "raw data in half size" option, some images
seem to be improperly decoded resulting in an unusable preview showing either
stripes or squares.

This happens:
- For both NEF files and DNG files created from those NEF files using Adobe DNG
converter
- For some pictures but not all of them
- Not always for the same pictures (which pictures are affected changes after
restarting DigiKam)

Pictures look normal when opened in the image editor as shown on the image in
the URL.

Using the embedded jpeg for previews works fine.

Reproducible: Sometimes

Steps to Reproduce:
1. Start DigiKam
2. Double click on thumbnail in album to bring up preview window
3. Select one thumbnail after the other in film strip to display previews until
one of them fails to render properly

Actual Results:  
Raw preview either partially or fully covered by stripes or squares

Expected Results:  
Properly decode raw image

Digikam installer: digiKam-5.0.0-2-Win64.exe
Windows 8.1 Pro, 8GB RAM

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