https://bugzilla.wikimedia.org/show_bug.cgi?id=47311
Web browser: ---
Bug ID: 47311
Summary: use vipsthumbnail to scale images
Product: MediaWiki extensions
Version: master
Hardware: All
OS: All
Status: NEW
Severity: normal
Priority: Unprioritized
Component: VipsScaler
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
Classification: Unclassified
Mobile Platform: ---
VipsScalar currently works by running a series of separate vips commands.
Looking at the source here:
https://gerrit.wikimedia.org/r/gitweb?p=mediawiki/extensions/VipsScaler.git;a=blob;f=VipsScaler_body.php;h=69f31b108d99849c36fd92591f135bfbfca69d02;hb=HEAD
makeCommands() will typically run something like:
# unpack png file to a huge disc temp
vips im_png2vips huge.png t1.v
# block shrink by large integer factor
vips im_shrink t1.v t2.v xx xx
# bilinear resize to final exact dimensions
vips im_resize_linear t2.v t3.v xxxx yyyy
# sharpen slightly to counteract softening effect of bilinear
vips im_convf t3.v t4.v sharpen_matrix
# any 90-degree rotation required
vips im_rotxx t4.v final.jpg
Instead, it should simply run vipsthumbnail:
vipsthumbnail huge.png -o final.jpg --size required-output-size-in-pixels
--interpolator bicubic
This requires vips 7.32.2 or later which is not yet in Debian and must be built
from source.
see https://bugzilla.wikimedia.org/show_bug.cgi?id=32721 for more detalis.
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