[digikam] [Bug 331397] New: preview and thumbnails colors are wrong for cr2

[Gregory]

https://bugs.kde.org/show_bug.cgi?id=331397

            Bug ID: 331397
           Summary: preview and thumbnails colors are wrong for cr2
    Classification: Unclassified
           Product: digikam
           Version: 3.4.0
          Platform: Ubuntu Packages
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: Thumbnails
          Assignee: [hidden email]
          Reporter: [hidden email]

For several CR2 files  (canon 350D)  preview images (digiKam says it is
embedded jpeg) are colored worng. In editor everything is OK and exactly as I
saw it in the camera screen.
What makes digiKam mostly unusable (at least  for me).
Convertion to DNG changes nothing.

CR2 are manually coped from the camera, not imported with digiKam.

Reproducible: Always

Actual Results:  
As described wronh colors/darkness on preview (embedded jpegs).
Hard to descrine the issue verbally, but I can provide an example CR2 and a
screenshot.  

Expected Results:  
same coloring for editor and preview

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[Gregory]

https://bugs.kde.org/show_bug.cgi?id=331397

--- Comment #1 from Gregory <[hidden email]> ---
Created attachment 85266
  --> https://bugs.kde.org/attachment.cgi?id=85266&action=edit
screen shot shows the difference between preview and editor view for the same
photo

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[Gilles Caulier-4]

https://bugs.kde.org/show_bug.cgi?id=331397

Gilles Caulier <[hidden email]> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
                 CC|                            |[hidden email]
         Resolution|---                         |INVALID

--- Comment #2 from Gilles Caulier <[hidden email]> ---
This file is invalid :

- Thumbnail from RAW use embedded JPEG image from RAW container.
- Preview can use embedded JPEG or half size demosaiced RAW.
- Image Editor use full size of demosaiced RAW

JPEG and RAW image data do not use the same workflow and do not give same
result. With RAW you need to reproduce whole post processing done by camera
firmware. With JPEG all is ready to use.

In other word, this behavior is normal. The best that you can do, is to use
half size demosaiced RAW with preview (it's an option from digiKam setup), but
take a care demosaicing take while to run. This is why thumbnail use embedded
JPEG for performance reasons...

Gilles Caulier

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[bugzilla_noreply]

https://bugs.kde.org/show_bug.cgi?id=331397

[hidden email] changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|Thumbs-Image                |Thumbs-RAW

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