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[digikam] [Bug 344154] New: Raw image previews sometimes get a few pixels cropped off in the periphery

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DrSlony-4

[digikam] [Bug 344154] New: Raw image previews sometimes get a few pixels cropped off in the periphery

https://bugs.kde.org/show_bug.cgi?id=344154

Bug ID: 344154
Summary: Raw image previews sometimes get a few pixels cropped
off in the periphery
Product: digikam
Version: 4.7.0
Platform: Gentoo Packages
OS: Linux
Status: UNCONFIRMED
Severity: major
Priority: NOR
Component: general
Assignee: [hidden email]
Reporter: [hidden email]

.

Reproducible: Always

Steps to Reproduce:
1. Import > Card Readers > download photos from my SD card to my HD. I have a
Pentax K10D camera fwiw.
2. Go to the folder with the downloaded images, click on the first, F3 to
preview it, and keep advancing to the next image.
3. I shoot panoramas and I use 5-step bracketing, so I end up with typically 8
angles: 6 around, nadir and zenith, and 5 bracketed shots per angle, for a
total of 40 shots. These shots are identical in every way. The bug is that
while viewing the previews, some shots look as if I zoomed in a bit. This is
impossible - it's not a zoom lens, and my tripod is rock solid. Looking at the
actual raw files in RawTherapee confirms that they are identical other than the
actual exposure. Looking at the embedded JPEG previews in Geeqie also confirms
that the preview matches the raw file. So the bug is in digiKam, which
sometimes for some reason decides to crop the thumbnail by a few pixel rows and
columns around the periphery, which makes it look as if I screwed up. This
means that I cannot use digiKam to sort my photos because the preview lies - I
might end up deleting photos thinking that I screwed up, when in fact the
photos were perfect. For this reason, I am marking this bug as "major", because
digiKam fails at its most basic purpose when I cannot even reliably preview my
raw photos, and therefore is unusable. I urge you to look into this before
releasing 4.8.0. I see no point making another release when something so basic
is unreliable, and viewing previews MUST be absolutely reliable.

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DrSlony-4

[digikam] [Bug 344154] Raw image previews sometimes get a few pixels cropped off in the periphery

https://bugs.kde.org/show_bug.cgi?id=344154

DrSlony <[hidden email]> changed:

What |Removed |Added
----------------------------------------------------------------------------
CC| |[hidden email]

--- Comment #1 from DrSlony <[hidden email]> ---
I copied the same photo several times into a new test folder. I rotated one of
them 90 degrees clockwise.
http://i.imgur.com/62hVOjE.png
Viewing the next photo after the rotated one triggered this bug, the photo's
preview was the wrong size and strangely enough the exposure was also
different. The next photo after this one was correct. I alt+tabbed back here to
write then, then I alt+tabbed back to digiKam, rotated another photo, and now
neither of them show the bug...

I triggered it again, this time on a pair of photos (remember, this is the same
file, copied many times!) rotated left.
http://i.imgur.com/hngMXZJ.jpg
http://i.imgur.com/nPJ6MWa.jpg
One is the JPEG preview, the other is the half-size raw preview. Why? We've
been discussing this in some other issue for over a year now, that these
automatic heuristics are a _VERY BAD IDEA_. I'm quite tired of banging my head
against the wall release after release, where each patch breaks something more.
Does anyone test these patches before committing them, is there any quality
control in digiKam?

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Gilles Caulier-4