[Digikam-devel] [Bug 233544] New: Wish: optional sharpening for scaled-down images in slideshow

[Matti Rintala]

https://bugs.kde.org/show_bug.cgi?id=233544

           Summary: Wish: optional sharpening for scaled-down images in
                    slideshow
           Product: digikam
           Version: 1.1.0
          Platform: openSUSE RPMs
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: wishlist
          Priority: NOR
         Component: general
        AssignedTo: digikam-devel at kde.org
        ReportedBy: bitti at cs.tut.fi


Version:           1.1.0 (using KDE 4.3.5)
OS:                Linux
Installed from:    openSUSE RPMs

Image experts recommend a sharpening workflow where the last stage of
sharpening, "output sharpening" is performed last using the final image
resolution. The advantages are obvious as different sharpening settings are
needed for different resolutions and different output devices. This means that
"master images" are stored without output sharpening (i.e., with only necessary
capture and possibly creative sharpening), and the final output sharpening is
performed when the output device is known and the image has been scaled to its
final resolution.

Digikam's slide show can be used to display the images to an audience. It would
be nice if slide show would optionally run a sharpening pass to the displayed
images, and Digikam's preferences would allow user to enable sharpening and
enter necessary settings (amount, radius and threshold for unsharp mask). My
guess is that this would be relatively easy to implement.

Already some web album generators allow output sharpening for web albums
(JAlbum, for example). In my experience this produces superior results, as any
sharpening performed on the original large image a) depends on whether the
image is going to be printed or displayed on screen and b) sharpening done on
the original resolution is often lost when the image is scaled down to screen
resolution.

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