Frederik Ramm <[EMAIL PROTECTED]> writes: > I'm currently doing some work on OSM animations (with Mapnik rendered > images). I have had good success by combining a number of wildly > different tiles into one image and then running > > convert sample.png -depth 8 -colors 256 -unique-colors colormap.png > > on it. The resulting colormap.png has one pixel per color. It could > still be tweaked manually if need be, and then you run > > convert tile.png -colors 256 -depth 8 -map colormap.png output.png > > on the payload images. The resulting file size is, in my case, slightly > smaller than a corresponding GIF image, and running an extra pngcrush on > the resultant file gives only one or two percent additional saving.
This is good to know. And if we user perlmagick we can save a couple thousand process starts per tileset. If there is some agreement that this is useful I would take a look implementing this. Matthias _______________________________________________ Tilesathome mailing list [email protected] http://lists.openstreetmap.org/listinfo/tilesathome
