https://bugzilla.wikimedia.org/show_bug.cgi?id=32721
--- Comment #10 from John Cupitt <[email protected]> 2012-03-19 14:20:17 UTC --- I've just realised that the -thumbnail option for convert is doing very crude subsampling, hence the horrible aliasing in the shrunk image. You need to use -resize to get a proper box filter: $ time convert Chicago.png -resize 800 -unsharp 0x.5 tn_Chicago-magick2.jpg real 0m14.497s user 0m20.601s sys 0m1.068s peak RES: 950M Which generates this image: http://www.vips.ecs.soton.ac.uk/development/tn_Chicago-magick2.jpg the same quality as the vips one, though vips is sharpening more. -- Configure bugmail: https://bugzilla.wikimedia.org/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are the assignee for the bug. You are on the CC list for the bug. _______________________________________________ Wikibugs-l mailing list [email protected] https://lists.wikimedia.org/mailman/listinfo/wikibugs-l
