I noticed that all of our icons were made in inkscape. It looks like inkspace is about 5x faster at rendering them to pngs than gimp:
$ time inkscape -o sps2.png --export-overwrite --export-type=png -d 96 256x256/mimetypes/application-x-spss-sps.svg ** (org.inkscape.Inkscape:2304684): WARNING **: 21:26:23.876: Fonts dir '/usr/share/inkscape/fonts' does not exist and will be ignored. Background RRGGBBAA: ffffff00 Area 0:0:256:256 exported to 256 x 256 pixels (96 dpi) ** (org.inkscape.Inkscape:2304684): WARNING **: 21:26:23.901: No cc:license metadata found, derived license URI from cc:License: http://creativecommons.org/licenses/by-sa/4.0/ real 0m0.276s user 0m6.598s sys 0m0.045s $ time ~/pspp/master/build-aux/svg2png 256x256/mimetypes/application-x-spss-sps.svg ../icons/COPYING_CCBYSA3 sps3.png Converting 256x256/mimetypes/application-x-spss-sps.svg to sps3.png size 0x0 gimp: GEGL-WARNING: (../gegl/buffer/gegl-tile-handler-cache.c:1076):gegl_tile_cache_destroy: runtime check failed: (g_queue_is_empty (&cache_queue)) EEEEeEeek! 2 GeglBuffers leaked real 0m1.053s user 0m2.850s sys 0m0.273s I don't see any quality difference in the output. I agree with the comment in Smake that ImageMagick does a bad job. Maybe it doesn't matter much though.
