[OSM-dev] Out of copyright WMS offering - looking for assistance

[Steve Hosgood]

Andy Robinson (blackadder-lists) wrote:
> Steve Hosgood wrote:
>   
>> Sent: 19 October 2009 9:39 AM
>> To: dev at openstreetmap.org
>> Cc: 'josm-dev'
>> Subject: Re: [OSM-dev] Out of copyright WMS offering - looking for
>> assistance
>>
>> Andy Robinson (blackadder-lists) wrote:
>>     
>>> Oh, and I forgot the most important issue. The plug-in is looking for
>>>       
>> png's
>>     
>>> when the ooc map tiles are all jpgs.
>>>
>>> Cheers
>>>
>>> Andy
>>>
>>>
>>>       
>> Must they be .jpgs? You'll get a lot of "sharp edge" artefacts using the
>> .jpg format on a map. In theory at least (and in practice whenever I've
>> done it) .png will give better results on material such as that.
>>
>>     
>
> Bear in mind these are printed maps, not rasterised vector maps. We tried
> with png but you can get much lower file size without loosing too much
> definition with the jpg's.
>
>   
That's OK then. You've done the tests, you've got your results.

> Now, if someone wants to spend the time proving me wrong they are welcome to
> a an original scan to try it.
>
>   

:-)

No - you've done the tests and in this case evidently .jpg wins. I'm 
surprised, but I've seen that happen before. I suppose it depends on 
just how sharp the "sharp edges" were on your images.

Steve.



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