On Wed, Dec 19, 2007 at 12:37:54PM +0000, Robert (Jamie) Munro wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > Jochen Topf wrote: > > Hi! > > > > http://svn.openstreetmap.org/applications/rendering/mapnik/generate_tiles.py > > uses a call to the external 'convert' program to reduce the number of colors > > for tiles rendered by Mapnik to 255. Since version r571 Mapnik supports > > writing to 8 bit palette PNGs. Palette PNGs are generally smaller than > > normal PNGs. > > > > Is there any reason NOT to change the code to use Mapniks function to > > write out the image directly as 8bit paletted PNG, make the images > > smaller and save the call to 'convert'? (If nobody comes up with a > > reason, I'll change the code.) > > AFAIK, the main reason the feature was added to mapnik was that /we/ > needed it because the external convert was really slow (about the same > amount of time as the whole rest of the render). > > So no, there is no reason not to change the code. Please do & make > mapnik run at twice the speed. Also, if you can make mapnik render > on-demand first, and only render the backlog when it's not busy, that > would probably be a great improvement.
You seem to be confusing generate_tiles.py with the rendering setup that is used on the main mapnik server. I don't think they're related. Also, you seem to think that rendering on demand is actually plausible under normal load -- it's not. This is a tool for developers, which (unless I'm crazy, which is possible) is almost totally unrelated to the production tile generation code. Regards, -- Christopher Schmidt MetaCarta _______________________________________________ dev mailing list [email protected] http://lists.openstreetmap.org/cgi-bin/mailman/listinfo/dev
