[Digikam-devel] [Bug 259223] New: [RFC][PATCH] Overexposure prevention in white balance tool

[pochini at shiny.it]

https://bugs.kde.org/show_bug.cgi?id=259223

           Summary: [RFC][PATCH] Overexposure prevention in white balance
                    tool
           Product: digikam
           Version: 1.6.0
          Platform: Compiled Sources
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: wishlist
          Priority: NOR
         Component: Image Editor
        AssignedTo: digikam-devel at kde.org
        ReportedBy: pochini at shiny.it


Created an attachment (id=54305)
 --> (http://bugs.kde.org/attachment.cgi?id=54305)
avoid overesposure in white balance

Version:           1.6.0 (using KDE 4.4.3) 
OS:                Linux

The white balance tool has a big problem in its current form: almost always it
overexposes and clips at least one of the rgb components. The exposure
compensation thing does not help here because it is applied on the already
clipped image.
I wrote a simple proof-of-concept patch (attached) that makes the wb tool
useable by scaling down the rgb multipiers just enough to prevent clipping.
The biggest problem with my patch is that the final image can be quite a lot
dimmer than the preview image because the scaler smooths the (usually tiny)
brightest spots of the photo.


Reproducible: Sometimes

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