[sldev] Webmap API change

[SignpostMarv Martin]

Overlays are likely to have a very limited colour palette, parcel 
borders/ownership especially.

Tools such as optipng can do wonders to decrease the size of certain 
PNGs, too.


~ Marv.

Ryan Williams (Which) wrote:
> Philip Rosedale wrote:
>   
>> I think that the problem is that you can only actually overlay
>> transparent images in a browser using .PNG, right?  So that means that
>> you can't really do it, because the only way to get anywhere near
>> reasonable performance is the compression you get from JPEG.
>>     
>
> The base images compress well with JPEG, but any overlay images you'd
> care to generate will likely compress well with PNG.  E.g. Google's map
> overlays are mostly transparent with solid blocks of color.  Also, while
> it is unacceptable to have slowly-loading base tiles, it's not as bad to
> have overlay tiles that take longer to download and pop in later, on
> top.  Food for thought.  :-)  Glad you made provision for overlays, though.
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