[sldev] Webmap API change

[Harold Brown]

For my region name overlays it doesn't improve any more then just using
"optipng *.png"

For reference the 'Da Boom' region map tile from the amazonS3 storage is
15K, so even without compression the name tiles are very tiny in comparison.



On Fri, Jan 30, 2009 at 1:57 PM, SignpostMarv Martin
<me at signpostmarv.name>wrote:

> 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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