If you need printing-quality rendering, you can take a look at <a href="http://maperitive.net/docs/manual/Commands/ExportBitmap.html#Scaling">http://maperitive.net/docs/manual/Commands/ExportBitmap.html#Scaling</a><div><br>
</div><div>Igor<br><br><div class="gmail_quote">On Wed, Jun 15, 2011 at 2:42 PM, Andy Allan <span dir="ltr"><<a href="mailto:gravitystorm@gmail.com">gravitystorm@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<div class="im">On Wed, Jun 15, 2011 at 1:23 PM, Parveen Arora <<a href="mailto:osm@parveenarora.in">osm@parveenarora.in</a>> wrote:<br>
> On Wed, Jun 15, 2011 at 10:10 AM, Graham Jones <<a href="mailto:grahamjones139@gmail.com">grahamjones139@gmail.com</a>> wrote:<br>
>> Hi Parveen,<br>
>> Do you mean resolution (pixels per inch) or level of detail (which icons<br>
>> appear at which zoom level?).<br>
> Yes I meant to pixels per inch.<br>
><br>
>> You can change the resolution if you use mapnik2, but that is something you<br>
>> would want to do for printed output rarher than a web based map?<br>
> Yes, someone asked me to print them for his area, but one I printed is<br>
> not of good quality.<br>
> So I wants to increase the resolution of tiles for local OSM Tile Server.<br>
<br>
</div>OK, so it's impossible to change the resolution of images, since they<br>
don't have a resolution. Images only have a number of pixels, that's<br>
it.<br>
<br>
When stuff is shown on screen it's usually shown around 90 pixels per<br>
inch. Most times when you print a webpage then it'll assume that you<br>
still want to print at 90 pixels per inch, regardless of the DPI of<br>
the printer. In order to look crisp, you want to find a way to<br>
instruct your printer to print at more pixels per inch, say 250 pixels<br>
per inch. Again, don't confuse this with the DPI setting of the<br>
printer, since that's about number of ink droplets on the page, and<br>
not to do with pixels per inch.<br>
<br>
Now to make things like the width of a road or icon of a church stay<br>
at the same size, you would need to increase the number of pixels they<br>
are measured in. So a road would need to be e.g. 15 pixels instead of<br>
5. That usually involves changing the stylesheets, although there is<br>
work on this going on in mapnik2 to allow this to be controlled<br>
without editing the stylesheet.<br>
<br>
You could have a look at the "oversize" tiles that CloudMade produce.<br>
<a href="http://developers.cloudmade.com/projects/tiles/documents" target="_blank">http://developers.cloudmade.com/projects/tiles/documents</a> . You can see<br>
in the second example everything is drawn bigger, so that if you were<br>
to print out at 180 pixels per inch it would look the same size as a<br>
normal map, but you'll end up with a better looking map.<br>
<br>
Finally, if you are printing it's often worth ignoring all this stuff<br>
and just printing from SVG. You can get SVG output from the Export<br>
tab.<br>
<br>
Cheers,<br>
<font color="#888888">Andy<br>
</font><div><div></div><div class="h5"><br>
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</div></div></blockquote></div><br></div>