[Digikam-devel] [Bug 205776] "Embedded preview loads full image size" does not only do what it says, confusing users

[Matti Rintala]

https://bugs.kde.org/show_bug.cgi?id=205776





--- Comment #40 from Matti Rintala <bitti cs tut fi>  2009-09-07 19:53:39 ---
I just discovered a flaw in the new preview algorithm when full-size previews
are requested:

When deciding whether the embedded image is large enough, the width of the
preview is compared to the width of the raw image itself. However, at least in
the case of Nikon raw files edited with NX2, if the image was taken in vertical
orientation, NX2 has already reset the exif orientation flag and the embedded
preview has been rotated. This causes Digikam to compare the rotated width of
the preview and the unrotated width of the raw data, which often causes it to
discard the preview as "too small".

Marcel, I'll send you the raw files so you can see for yourself.

I think this clever new algorithm may not be so clever after all. It's very
confusing to browse photos, and some of the previews are embedded, some are
raw-decoded by Digikam.

Maybe we need a user preference after all, since one user probably always wants
either to use embedded previews or raw previews decoded by Digikam.

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