If you need printing-quality rendering, you can take a look at http://maperitive.net/docs/manual/Commands/ExportBitmap.html#Scaling
Igor On Wed, Jun 15, 2011 at 2:42 PM, Andy Allan <[email protected]> wrote: > On Wed, Jun 15, 2011 at 1:23 PM, Parveen Arora <[email protected]> > wrote: > > On Wed, Jun 15, 2011 at 10:10 AM, Graham Jones <[email protected]> > wrote: > >> Hi Parveen, > >> Do you mean resolution (pixels per inch) or level of detail (which icons > >> appear at which zoom level?). > > Yes I meant to pixels per inch. > > > >> You can change the resolution if you use mapnik2, but that is something > you > >> would want to do for printed output rarher than a web based map? > > Yes, someone asked me to print them for his area, but one I printed is > > not of good quality. > > So I wants to increase the resolution of tiles for local OSM Tile Server. > > OK, so it's impossible to change the resolution of images, since they > don't have a resolution. Images only have a number of pixels, that's > it. > > When stuff is shown on screen it's usually shown around 90 pixels per > inch. Most times when you print a webpage then it'll assume that you > still want to print at 90 pixels per inch, regardless of the DPI of > the printer. In order to look crisp, you want to find a way to > instruct your printer to print at more pixels per inch, say 250 pixels > per inch. Again, don't confuse this with the DPI setting of the > printer, since that's about number of ink droplets on the page, and > not to do with pixels per inch. > > Now to make things like the width of a road or icon of a church stay > at the same size, you would need to increase the number of pixels they > are measured in. So a road would need to be e.g. 15 pixels instead of > 5. That usually involves changing the stylesheets, although there is > work on this going on in mapnik2 to allow this to be controlled > without editing the stylesheet. > > You could have a look at the "oversize" tiles that CloudMade produce. > http://developers.cloudmade.com/projects/tiles/documents . You can see > in the second example everything is drawn bigger, so that if you were > to print out at 180 pixels per inch it would look the same size as a > normal map, but you'll end up with a better looking map. > > Finally, if you are printing it's often worth ignoring all this stuff > and just printing from SVG. You can get SVG output from the Export > tab. > > Cheers, > Andy > > _______________________________________________ > dev mailing list > [email protected] > http://lists.openstreetmap.org/listinfo/dev >
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