Hi,
On 06/27/2012 01:10 AM, Robert Joop wrote:
3. Modify style as per 1., double size of meta tiles to 4096x4096, and
double size of tiles to 512x512. This avoids the increase in font
nastiness *and* it has the nice effect that one "Retina" tile at a
certain zoom level shows exactly the same content as a normal tile, just
on 512x512 instead of 256x256 and therefore at twice the resolution. It
would, however, require clients (OpenLayers et al.) to work with the
larger tile size.
This option sounded best to me as well.
I just tried this out and found that, on a standard non-mobile
Firefox browser, OpenLayers displays the new 512x512 tile just fine,
it scales it to 256x256 in the browser. I can then use the browser's
"zoom" function to blow up the OpenLayers display and while
everything becomes jaggy when I do this with normal tiles, the map
still looks nice when using the double resolution tiles. Does this
mean that it would be an acceptable viewing experience for mobile
users as well?
Most likely, I’d guess.
I’d like to try it on some devices with pixel ratio > 1, like the Nexus
One with its penTile display
http://en.wikipedia.org/wiki/Nexus_One#Hardware
or the iPhone 4.
Is your test setup publicly accessible?
It is now, here:
http://mull.geofabrik.de/hires.html
By default this will come up with standard Mapnik tiles from osm.org,
but you can switch to my hires tiles in the layer switcher. If I do this
in Firefox on my desktop machine, there's hardly any difference between
the two, as OL downscales the images from 512x512 to 256x256 for
display. Only if you right-click on an image will you see that it is
indeed bigger than normal.
I'd be interested in hearing from users of high-resolution displays if
these big tiles actually make a difference (except being slower to
load...).
Feel free to play with these tiles (tile URL is e.g.
http://mull.geofabrik.de/osm2x/6/33/21.png), but note that this is a
play server that may or may not be working, and is likely to be slow
(currently pre-rendered only up to z11), and also I'll probably drop
this tile set in a few weeks so if you read this in a mailing list
archive later the link will be dead.
Bye
Frederik
--
Frederik Ramm ## eMail [email protected] ## N49°00'09" E008°23'33"
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