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=19.28081https://lists.berlios.de/pipermail/mapnik-users/2009-February/001651.htmlOn 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.pngLegend:
without effect opacity(Your example)
merge-grain(mine) multiply(mapy.cz)
Marcin Rudowski
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