[Digikam-devel] [Bug 159397] New: Resize quality is really bad

[Kamil Stepinski]

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http://bugs.kde.org/show_bug.cgi?id=159397         
           Summary: Resize quality is really bad
           Product: digikam
           Version: 0.9.2
          Platform: Ubuntu Packages
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: wishlist
          Priority: NOR
         Component: general
        AssignedTo: digikam-devel kde org
        ReportedBy: kamil.stepinski gmail com


Version:           0.9.2 (using KDE 3.5.8)
Installed from:    Ubuntu Packages
OS:                Linux

Guys,

I see the similar report in the most recent bugs (Bug 152192) but as far as I can see you ended up with no conclusion? Was the bug resolved in the next version of digiKam? No statement there...
Well.. Here's how I see things:


The image resizing quality is _really bad_ in digiKam (I have 0.9.2 installed).
It's so bad that the output is just unacceptable for me. :(

I really think you should add a selection box with a few algorithms (Hermite, Mitchell, Lanczos, etc.) with Lanczos as a default one because it provides the best results.
Currently I'm resizing all pictures with IrfanView (runs well under Wine) and the rest of postprocessing is done in digiKam. It's not the most convenient let me tell you...
I think you should consider the current resize quality as a major issue - as it is a tool that is used very frequently.

Here's the link to the example of the resize quality comparison:

http://picasaweb.google.com/kamil.stepinski/Digikam/photo#5178275271094829746

Please observe car window edges.

1 - digiKam 0.9.2 to the left, IrfanView 4.10 to the right
2 - resizing from 5Mpix camera to 800x600, IrfanView is using Lanczos filter, digiKam is using I-don't-know-what.

That's the only major problem I have with digiKam. I think the resize has been working much better in 0.8.x version.

At the end -> Thanks guys for the great piece of software! The application is really great!