[Bug 677114] New: [pitivi] VideoScale lanczos downscaling is not pretty
bugzilla at gnome.org
Wed May 30 09:56:23 PDT 2012
GStreamer | gst-plugins-base | 0.10.36
Summary: [pitivi] VideoScale lanczos downscaling is not pretty
AssignedTo: gstreamer-bugs at lists.freedesktop.org
ReportedBy: nekohayo at gmail.com
QAContact: gstreamer-bugs at lists.freedesktop.org
GNOME version: ---
Created an attachment (id=215267)
comparing VideoScale bilinear, VideoScale Lanczos and gimp GIMP Lanczos3
Pitivi uses VideoScale's method #3 (GST_VIDEO_SCALE_LANCZOS) for thumbnailing
(height = 50 pixels). It seems there is a slight improvement over the default
method (bilinear), but the difference is very minor and I can't help but to
compare with gimp's bicubic or lanczos3 scaling that looks much better (because
it's smoothed, somehow).
Attached is a screenshot comparing
- pitivi 0.15 (videoscale bilinear)
- pitivi GES (videoscale lanczos)
- the same images (from a 2K source) resized by GIMP's Lanczos
Perhaps there is something suboptimal going on with VideoScale when downscaling
to small sizes? Or is it something that is done incorrectly in Pitivi's code? I
tried playing with various values of the "sharpen", "shapness" and "envelope"
properties, no luck.
(the bus-handler sets the element's props.method = 3)
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