https://bugs.kde.org/show_bug.cgi?id=462467
Bug ID: 462467
Summary: Improve album thumbnails
Classification: Applications
Product: digikam
Version: 7.8.0
Platform: Other
OS: Other
Status: REPORTED
Severity: normal
Priority: NOR
Component: Albums-TreeView
Assignee: digikam-bugs-n...@kde.org
Reporter: thoma...@gmail.com
Target Milestone: ---
SUMMARY
Album thumbnails are almost useless in that even at a size of 32x32 or 48x48 a
moderately detailed photography is illegible.
Obviously, there are some inherent difficulties in taking a high resolution
image and brutally scaling it down to fit in a tiny icon. However, this is a
problem that is solved in other apps by resizing a smarter way.
Below is a more intelligent resizing algorithm that would greatly improve the
thumbnail.
1. If the image is not square: crop the image so that it becomes square by
cutting off equal parts of each end of the height or width (whichever is
longest)
2. Crop 25 % of all the sides of the image. (center crop) This effectively
halves height and width of the image.
# Here we assume that the image will have most key details within the center
half of the image. This might not hold always, but if it doesn't for a
particular photo then that photo is not likely going to be a decent
icon/thumbnail anyway.
3. Resize the image to whatever thumbnail icon size is appropriate. 48x48,
32x32, etc.
I have made a visual explanation of this improved resize algorithm here:
https://justpaste.it/improved-resize
The link also includes a comparison of the resulting icon thumbnails made with
both current resize algorithm and the new one.
STEPS TO REPRODUCE
1. Go to Album view
2. Open an album.
3. Right click on a photo thumbnail.
4. Click: Set as album thumbnail
5. Observe the album thumbnail
OBSERVED RESULT
Album thumbnail is almost unrecognizable.
EXPECTED RESULT
Would expect the album thumbnail to be at least enough recognizable such that
the user could easily see what the main object in the photo is. Thus, allowing
the user to more quickly distinguish a specific album from the rest (without
having to read the album name)
SOFTWARE/OS VERSIONS
Windows: all
macOS: all
Linux/KDE Plasma: all
(available in About System)
KDE Plasma Version: N/A
KDE Frameworks Version: N/A
Qt Version: N/A
ADDITIONAL INFORMATION
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