[sldev] Webmap API change

[SignpostMarv Martin]

optipng -o7 *.png

~ Marv :-P

Harold Brown wrote:
> I just did a test run of optipng (without any command line options) on 
> one of my region name overlay folders.  It reduced the file sizes from 
> around 2k per image down to 1k per image.
>
> I'll need to add that into my image generator to use optipng.
>
>
>
> On Fri, Jan 30, 2009 at 9:40 AM, SignpostMarv Martin 
> <me at signpostmarv.name <mailto:me at signpostmarv.name>> wrote:
>
>     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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