I've started a process of forcing old rendered thumbnails to regenerate. This
will gradually replace old rendered images over the next couple days as several
issues have been fixed recently:
* Many PNG thumbs defaulted to unnecessarily high bit depth, wasting bandwidth
* JPEG thumbs were at a somewhat higher quality than needed, wasting bandwidth
* Some PNG and JPEG thumbs were sized a pixel off due to mismatches in how
MediaWiki and ImageMagick rounded the resized aspect ratio; these could get
resized in the client, leading to extra blurry scaling
* Lots of SVG rendering problems fixed by upgrading to librsvg 2.14.0
Since invalidating *all* thumbs brought things to a halt doing nothing but
rerendering, I've currently got it invalidating thumbs over a year old, and will
be moving up the cutoff date gradually over the next day or two.
-- brion vibber (brion @
pobox.com)