https://bugs.kde.org/show_bug.cgi?id=360830
Bug ID: 360830
Summary: Implement high quality scaling filters for pages
Product: okular
Version: unspecified
Platform: Compiled Sources
OS: Linux
Status: UNCONFIRMED
Severity: wishlist
Priority: NOR
Component: general
Assignee: okular-devel@kde.org
Reporter: kdeb...@fratti.ch
Currently, pages are scaled with what appears to be bilinear filtering. While
fast, this can often result in a blurry picture. While this isn't too much of
an issue when reading a PDF document, it can be pretty annoying when reading
small text in a CBZ that's zoomed in to fit the page width.
Examples for scaling filters can be found in mpv's documentation:
https://mpv.io/manual/stable/#video-output-drivers-bilinear
I'd suggest Mitchell-Netravali, here's a PDF of the paper I found:
www.cs.utexas.edu/users/fussell/courses/cs384g/lectures/mitchell/Mitchell.pdf
Additionally, the current bilinear interpolation should be done using GPU
accelaration if available, if this isn't already the case, for performance and
power saving purposes.
Reproducible: Always
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