Colin Marquardt pisze: > The relief layer is different of course, but not so much IMO: > http://m4.mapserver.mapy.cz/relief-l/11_7e60000_8480000 vs. > http://opentiles.com/cmarqu/tiles_relief/12/2209/1372.png > > Does anybody have a guess as to what the crucial difference is? > They are more different then You think. In Your case You shade luminosity and assign opacity 0.7 (constant alfa). In mapy.cz image is all black and in fact shaded alfa channel is making it look relief.
Try to invert Your gray value and make it alfa of new black image. Then simple composition with base layer without any additional opacity change in OpenLayers should be enough. Nice trick with multiplication by using www browser to apply alfa and make it hillshaded. I tried this too when experimenting, but finally decided for different approach (like gimp's merge-grain): http://mapa.ump.waw.pl/ump-www/?zoom=10&lat=49.54125&lon=19.28081 https://lists.berlios.de/pipermail/mapnik-users/2009-February/001651.html On the other side, I have some areas too bright. Comparison of different methods using Your image: http://mapa.ump.waw.pl/ump-www/mapnik/composing.png Legend: without effect opacity(Your example) merge-grain(mine) multiply(mapy.cz) Marcin Rudowski _______________________________________________ Mapnik-users mailing list [email protected] https://lists.berlios.de/mailman/listinfo/mapnik-users
