https://bugs.kde.org/show_bug.cgi?id=500628
Bug ID: 500628
Summary: [Feature Request] Issues with Smooth scaling in the
thumbnail and pixel art
Classification: Applications
Product: dolphin
Version: unspecified
Platform: Compiled Sources
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: dolphin-bugs-n...@kde.org
Reporter: ender_...@outlook.com
CC: kfm-de...@kde.org
Target Milestone: ---
Created attachment 178775
--> https://bugs.kde.org/attachment.cgi?id=178775&action=edit
Showing the pixel art look strange with smooth scaling thumbnail
SUMMARY
This is not really a bug, more so a feature request for the thumbnailer. I'm
posting this here because "meven" told me to.
https://discuss.kde.org/t/dont-do-interpolation-in-thumbnails-when-the-image-is-small-resolution/30589
In summary,
- The thumbnailer uses Smooth Scaling.
- This does not look good on pixel art.
STEPS TO REPRODUCE
1. Get some pixel art
2. View the thumbnail
3. Note the weird blurry look due to smooth scaling
OBSERVED RESULT
Blurry thumbnail for pixel art
EXPECTED RESULT
Sharp thumbnail for pixel art (not smoothed out)
SOFTWARE/OS VERSIONS
(available in the Info Center app, or by running `kinfo` in a terminal window)
Linux/KDE Plasma: Arch Linux
KDE Plasma Version: 6.3.1
KDE Frameworks Version: 6.11.0
Qt Version: 6.8.2
ADDITIONAL INFORMATION
According to this reddit commenter here:
https://old.reddit.com/r/kde/comments/1ivwa2d/cant_disable_interpolation_on_the_dolphin/me9s4ja/
the thumbnail scaling method can be toggled via a single chosen enum. This is
in dolphin/src/kitemviews/private/kpixmapmodifier.cpp line 284, changing the
last argument in pixmap.scaled from Qt::SmoothTransformation to
Qt::FastTransformation.
Although I am not a C++ developer I propose two possible solutions.
1: An option is added in the settings to toggle smooth scaling or fast scaling
for all thumbnail generation.
2: In the void function in the source code, check if the image resolution is
larger than some height and width constant. If it is, use smooth scaling,
otherwise if it is smaller then use fast scaling.
3: Do solution 2, but give the user an option to choose the height and width
boundary for Smooth vs Fast scaling in thumbnail.
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