Dirk-Lüder Kreie wrote: > Jannis Achstetter schrieb: >> Hello list, >> >> of course I support the idea to reduce the colors of a tile but can we >> use a little more colors than now? >> the reason I'm writing is this: >> http://informationfreeway.org/?lat=49.97776785345019&lon=9.148058101976218&zoom=17&layers=B000F000F >> >> >> >> Have a look at the traffic-lights and the pharmacy-icons. Adding some >> more colors or adjusting the icons might help here. > > Thanks for spotting, increased colour depth to 256 colours.
Hmm this seems to really be quite a difficult example. Even in the 256 colour case, the traffic lights don't look good. I have added an example tile from that to the wiki page. (http://wiki.openstreetmap.org/index.php/Tiles%40home/ColorPallet) I could imagine that the following is happening. The traffic lights only have a very few pixels, so not enough "weight" for the algorithm to conserve their colours. Yet, because they form a contiguous region with high visual saliency, the deviation is well perceivable. So I guess these symbols will cause automated algorithms more problems than the simple linear features such as roads. Thanks for the good test case. Kai > > > ------------------------------------------------------------------------ > > _______________________________________________ > Tilesathome mailing list > [email protected] > http://lists.openstreetmap.org/cgi-bin/mailman/listinfo/tilesathome _______________________________________________ Tilesathome mailing list [email protected] http://lists.openstreetmap.org/cgi-bin/mailman/listinfo/tilesathome
